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A226941 Expansion of 1/((1-x)(1-3x)(1-6x)(1-10x)(1-15x)). 0
1, 35, 798, 15178, 262739, 4310073, 68451856, 1065454016, 16372593237, 249520885471, 3782278181474, 57129692163414, 860905800344695, 12953222527379429, 194694881199600852, 2924389779305546572, 43905519073297744313, 658979550560400579147, 9888661146758667705190 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Note that the denominator has 5 triangular numbers: 1, 3, 6, 10, and 15.

LINKS

Table of n, a(n) for n=1..19.

FORMULA

a(n) = (15^(n+4) - 6*10^(n+4) + 14*6^(n+4) - 15*3^(n+4) + 6)/7560.

CROSSREFS

Column k = 4 of A080248. Cf. A003462, A016211, A021514.

Sequence in context: A066553 A137309 A028024 * A249883 A249884 A223957

Adjacent sequences:  A226938 A226939 A226940 * A226942 A226943 A226944

KEYWORD

nonn

AUTHOR

Yahia Kahloune, Jun 23 2013

STATUS

approved

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Last modified October 17 04:09 EDT 2019. Contains 328106 sequences. (Running on oeis4.)