id:A077834 - OEIS Search Results

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Expansion of 1/(1-2*x-2*x^2-3*x^3).

+0
2

1, 2, 6, 19, 56, 168, 505, 1514, 4542, 13627, 40880, 122640, 367921, 1103762, 3311286, 9933859, 29801576, 89404728, 268214185, 804642554, 2413927662, 7241782987, 21725348960, 65176046880, 195528140641, 586584421922, 1759753265766, 5279259797299, 15837779391896 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`Convolution of A000244 and A049347. G.f. : 1/((1-3x)(1+x+x^2)); a(n)=sum{k=0..n, 3^k2sqrt(3)cos(2pi(n-k)/3+pi/6)/3}; a(n)=3^(n+2)/13+2sqrt(3)cos(2pin/3+pi/6)/39+2sqrt(3)sin(2pi*n/3+pi/3)/13. - Paul Barry (pbarry(AT)wit.ie), May 19 2004`
	CROSSREFS	`Sequence in context: A014559 A027098 A121483 this_sequence A067675 A037512 A111277` `Adjacent sequences: A077831 A077832 A077833 this_sequence A077835 A077836 A077837`
	KEYWORD	`nonn`
	AUTHOR	`njas, Nov 17 2002`

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Last modified September 5 19:27 EDT 2008. Contains 143485 sequences.

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