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A100136 Sum C(n-3k,3k)3^k, k=0..floor(n/6). 1
1, 1, 1, 1, 1, 1, 4, 13, 31, 61, 106, 169, 262, 424, 748, 1417, 2749, 5251, 9709, 17395, 30553, 53434, 94285, 168859, 306283, 558742, 1017895, 1844044, 3320044, 5952472, 10660177, 19119385, 34383781, 61985497, 111884665, 201938701, 364128136 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,7

LINKS

Table of n, a(n) for n=0..36.

Index entries for linear recurrences with constant coefficients, signature (3,-3,1,0,0,3).

FORMULA

G.f.: (1-x)^2/((1-x)^3-3x^6); a(n)=3a(n-1)-3a(n-2)+a(n-3)+3a(n-6).

CROSSREFS

Cf. A100134.

Sequence in context: A191189 A106302 A158842 * A097120 A098536 A216563

Adjacent sequences:  A100133 A100134 A100135 * A100137 A100138 A100139

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Nov 06 2004

STATUS

approved

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Last modified February 24 18:24 EST 2018. Contains 299628 sequences. (Running on oeis4.)