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A100135 Sum C(n-3k,3k)2^k, k=0..floor(n/6). 1
1, 1, 1, 1, 1, 1, 3, 9, 21, 41, 71, 113, 173, 269, 443, 777, 1413, 2577, 4615, 8065, 13813, 23413, 39691, 67801, 116973, 203337, 354519, 617345, 1071197, 1851677, 3192731, 5501033, 9485621, 16381185, 28330119, 49035777, 84883621, 146875717 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,7

LINKS

Table of n, a(n) for n=0..37.

FORMULA

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

CROSSREFS

Cf. A100134.

Sequence in context: A029494 A059774 A064999 * A024173 A097119 A146608

Adjacent sequences:  A100132 A100133 A100134 * A100136 A100137 A100138

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Nov 06 2004

STATUS

approved

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Last modified February 21 16:54 EST 2018. Contains 299414 sequences. (Running on oeis4.)