cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A320846 Expansion of Product_{k>=1} 1/(1 - x^(k^2))^A037444(k).

Original entry on oeis.org

1, 1, 1, 1, 3, 3, 3, 3, 6, 10, 10, 10, 14, 22, 22, 22, 35, 47, 57, 57, 79, 95, 115, 115, 146, 217, 247, 267, 307, 433, 473, 513, 598, 779, 985, 1045, 1253, 1489, 1861, 1941, 2272, 2859, 3397, 3847, 4301, 5467, 6171, 6991, 7688, 9531, 11559, 12749, 14693
Offset: 0

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Author

Ilya Gutkovskiy, Nov 11 2018

Keywords

Comments

a(n) is the number of partitions of n into squares k^2 of A037444(k) kinds.

Examples

			a(8) = 6 because we have [{4}, {4}], [{4}, {1, 1, 1, 1}], [{4}, {1}, {1}, {1}, {1}], [{1, 1, 1, 1}, {1, 1, 1, 1}], [{1, 1, 1, 1}, {1}, {1}, {1}, {1}] and [{1}, {1}, {1}, {1}, {1}, {1}, {1}, {1}].
		

Crossrefs

Programs

  • Mathematica
    b[n_] := b[n] = SeriesCoefficient[Product[1/(1 - x^k^2), {k, 1, n}], {x, 0, n^2}]; a[n_] := a[n] = SeriesCoefficient[Product[1/(1 - x^k^2)^b[k], {k, 1, n}], {x, 0, n}]; Table[a[n], {n, 0, 52}]

Formula

G.f.: Product_{k>=1} 1/(1 - x^A000290(k))^A001156(A000290(k)).
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