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A029074 Expansion of 1/((1-x)(1-x^4)(1-x^7)(1-x^9)). 1
1, 1, 1, 1, 2, 2, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10, 12, 13, 15, 16, 18, 20, 22, 24, 26, 29, 31, 34, 37, 40, 43, 46, 50, 53, 57, 61, 66, 70, 74, 79, 84, 89, 94, 100, 106, 112, 118, 124, 131, 138, 145, 152, 160, 168, 176 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Number of partitions of n into parts 1, 4, 7 and 9. - Ilya Gutkovskiy, May 18 2017

LINKS

Iain Fox, Table of n, a(n) for n = 0..10000

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

FORMULA

From Iain Fox, Nov 30 2017: (Start)

a(n) = a(n-1) + a(n-4) - a(n-5) + a(n-7) - a(n-8) + a(n-9) - a(n-10) - a(n-11) + a(n-12) - a(n-13) + a(n-14) - a(n-16) + a(n-17) + a(n-20) - a(n-21), n > 20.

Lim_{n->infinity} a(n)/a(n+1) = 1.

(End)

a(n) ~ n^3/1512. - Vaclav Kotesovec, Dec 22 2017

MATHEMATICA

CoefficientList[Series[1/((1-x)(1-x^4)(1-x^7)(1-x^9)), {x, 0, 60}], x] (* Harvey P. Dale, Aug 19 2014 *)

PROG

(PARI) first(n) = Vec(1/((1-x)*(1-x^4)*(1-x^7)*(1-x^9)) + O(x^n)) \\ Iain Fox, Nov 30 2017

CROSSREFS

Sequence in context: A194820 A076872 A008906 * A258741 A036016 A051918

Adjacent sequences:  A029071 A029072 A029073 * A029075 A029076 A029077

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified August 4 12:33 EDT 2021. Contains 346447 sequences. (Running on oeis4.)