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.

A294620 Expansion of Product_{k>0} (1 - k^2*x^k)^(1/k).

Original entry on oeis.org

1, -1, -2, -1, -3, 7, -12, 32, -10, -15, 77, 187, -760, 846, 1382, -4197, 1371, 6650, -9991, 19220, -32439, -80889, 290596, 127853, -1372003, 913414, 3253746, -6728692, 2302327, 14461937, -46087740, 66588519, 15702643, -357119564, 752905288, 310992687
Offset: 0

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Author

Seiichi Manyama, Nov 05 2017

Keywords

Crossrefs

Programs

  • PARI
    N=66; x='x+O('x^N); Vec(prod(k=1, N, (1-k^2*x^k)^(1/k)))

Formula

a(0) = 1 and a(n) = -(1/n) * Sum_{k=1..n} A073705(k)*a(n-k) for n > 0.