A100135 - OEIS

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A100135

Sum C(n-3k,3k)2^k, k=0..floor(n/6).

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; internal format)

	OFFSET	`0,7`
	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 (pbarry(AT)wit.ie), Nov 06 2004`

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Last modified February 17 02:48 EST 2012. Contains 205978 sequences.