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A338732 Generating function Sum_{n >= 0} a(n)*x^n = Sum_{k>=1} x^(k*(3*k+1))/(1-x^k). 3
0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 2, 1, 3, 1, 2, 2, 3, 1, 3, 1, 3, 2, 2, 1, 4, 1, 2, 2, 3, 1, 3, 1, 3, 2, 2, 1, 4, 1, 2, 2, 3, 1, 3, 1, 4, 2, 2, 1, 4, 2, 2, 2, 3, 1, 4, 1, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,15

COMMENTS

The OEIS contains many very similar sequences, but this one was missing.

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..10000

PROG

(PARI) my(N=66, x='x+O('x^N)); concat([0, 0, 0, 0], Vec(sum(k=1, N, x^(k*(3*k+1))/(1-x^k)))) \\ Seiichi Manyama, Dec 04 2020

CROSSREFS

Cf. A001227, A081757, A117277, A330889, A338730, A338731.

Sequence in context: A184319 A160987 A230773 * A309026 A160986 A287867

Adjacent sequences:  A338729 A338730 A338731 * A338733 A338734 A338735

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 03 2020

STATUS

approved

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Last modified January 23 17:09 EST 2022. Contains 350514 sequences. (Running on oeis4.)