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A057176
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a(0) = 1; for n >= 1, a(n) = Sum_{j=0..a(n-1) mod n} a(j).
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7
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1, 1, 2, 4, 1, 2, 4, 9, 2, 4, 9, 30, 15, 4, 9, 30, 97, 84, 84, 26, 15, 127, 308, 30, 15, 127, 898, 24, 913, 97, 24, 913, 308, 69, 2, 4, 9, 30, 2996, 4217, 308, 560, 97, 69, 1040, 11, 69, 868, 9, 30, 2996, 7327, 14566, 13618, 39, 11544, 26, 1938, 913
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listen;
history;
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OFFSET
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0,3
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LINKS
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FORMULA
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a(0) = 1; for n >= 1, a(n) = Sum_{j=0..a(n-1) mod n} a(j).
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MATHEMATICA
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a[m_] := Sum[a[j], {j, 0, Mod[a[m-1], m]}]; vv={1}; Do[a[n]=If[n==0, 1, b]; v=a[n+1]; vv=Insert[vv, v, -1]; b=v, {n, 0, 50}]; vv
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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