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A024437 Expansion of 1/((1-x)(1-7x)(1-8x)(1-9x)). 1
1, 25, 410, 5570, 67971, 774075, 8402620, 88071940, 898959941, 8988218525, 88404153630, 858025759110, 8237487011911, 78372461725375, 740024044725440, 6943130337867080, 64790256275839881, 601800374629166625 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Matthew House, Table of n, a(n) for n = 0..1040

Index entries for linear recurrences with constant coefficients, signature (25,-215,695,-504).

FORMULA

G.f.: 1/((1-x)(1-7x)(1-8x)(1-9x)).

a(n) = (21*9^(n+3) - 6*8^(n+4) + 4*7^(n+4) - 1)/336. - Yahia Kahloune, Jun 28 2013

a(n) = 25*a(n-1) - 215*a(n-2) + 695*a(n-3) - 504*a(n-4). - Matthew House, Jan 16 2017

CROSSREFS

Sequence in context: A028057 A260953 A025998 * A028041 A025995 A023955

Adjacent sequences:  A024434 A024435 A024436 * A024438 A024439 A024440

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified December 2 17:08 EST 2021. Contains 349445 sequences. (Running on oeis4.)