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A051495 Expansion of (1 + x + 2*x^2 - x^3 + x^4)/(1 - 3*x^3 + 3*x^6 - x^9). 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

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 * A286542 A278973 A073256

Adjacent sequences:  A051492 A051493 A051494 * A051496 A051497 A051498

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified November 23 13:02 EST 2020. Contains 338590 sequences. (Running on oeis4.)