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A308154
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G.f.: x * Product_{j>=1, k>=1} (1 + a(j)*x^(j*k)).
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1
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1, 1, 2, 5, 11, 26, 64, 159, 397, 1042, 2701, 7249, 19341, 52927, 143615, 399359, 1099846, 3087498, 8616361, 24386458, 68617936, 195678409, 554862501, 1590363317, 4539073167, 13071768304, 37496646028, 108449257539, 312439316258, 906653694239, 2622887257356
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OFFSET
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1,3
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LINKS
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MAPLE
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A:= proc(n) option remember; series(x*`if`(n=1, 1, mul(mul(
1+a(j)*x^(j*k), k=1..(n-1)/j), j=1..n-1)), x, n+1)
end:
a:= n-> coeff(A(n), x, n):
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MATHEMATICA
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a[n_] := a[n] = SeriesCoefficient[x Product[Product[(1 + a[j] x^(j k)), {k, 1, n - 1}], {j, 1, n - 1}], {x, 0, n}]; Table[a[n], {n, 1, 32}]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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