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.

A376805 Expansion of 1/((1 - x^2)^3 - 9*x)^(1/3).

Original entry on oeis.org

1, 3, 19, 138, 1072, 8661, 71758, 605094, 5169286, 44605527, 387969346, 3396331158, 29891385937, 264264469542, 2345319267553, 20883723678234, 186497307222706, 1669724703219384, 14983025158691938, 134719748524295094, 1213531265862339751
Offset: 0

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Author

Seiichi Manyama, Oct 04 2024

Keywords

Crossrefs

Programs

  • PARI
    my(N=30, x='x+O('x^N)); Vec(1/((1-x^2)^3-9*x)^(1/3))

Formula

a(n) = Sum_{k=0..floor(n/2)} (-9)^(n-2*k) * binomial(-1/3,n-2*k) * binomial(3*n-5*k,k).