A051495 Expansion of (1 + x + 2*x^2 - x^3 + x^4)/(1 - 3*x^3 + 3*x^6 - x^9).

1, 1, 2, 2, 4, 6, 3, 9, 12, 4, 16, 20, 5, 25, 30, 6, 36, 42, 7, 49, 56, 8, 64, 72, 9, 81, 90, 10, 100, 110, 11, 121, 132, 12, 144, 156, 13, 169, 182, 14, 196, 210, 15, 225, 240, 16, 256, 272, 17, 289, 306, 18, 324, 342, 19, 361, 380, 20, 400, 420

Offset

0,3

Links

Table of n, a(n) for n=0..59.

Index entries for linear recurrences with constant coefficients, signature (0, 0, 3, 0, 0, -3, 0, 0, 1).

Prog

(PARI) Vec((1 + x + 2*x^2 - x^3 + x^4)/(1 - 3*x^3 + 3*x^6 - x^9) + O(x^60)) \\ Michel Marcus, Mar 06 2020

Crossrefs

Sequence in context: A209999 A127718 A115068 * A368157 A286542 A278973

Adjacent sequences: A051492 A051493 A051494 * A051496 A051497 A051498

Keyword

nonn

Author

N. J. A. Sloane

Status

approved