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 A100133 Sum C(n-2k,2k)3^k*2^(n-4k), k=0..floor(n/4). 2
 1, 2, 4, 8, 19, 50, 136, 368, 985, 2618, 6940, 18392, 48763, 129338, 343120, 910304, 2415025, 6406898, 16996852, 45090728, 119620579, 317340098, 841868632, 2233386320, 5924932489, 15718204970, 41698695820, 110622122360 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Binomial transform of 1,1,1,1,4,4,10,10,28,28,76,... (g.f. (1-x)(1+x)^2/(1-2x^2-2x^4)). LINKS Index entries for linear recurrences with constant coefficients, signature (4,-4,0,3) FORMULA G.f.: (1-2x)/((1-2x)^2-3x^4); a(n)=4a(n-1)-4a(n-2)+3a(n-3). CROSSREFS Cf. A100131, A100132. Sequence in context: A005703 A172383 A003081 * A099598 A269023 A173310 Adjacent sequences:  A100130 A100131 A100132 * A100134 A100135 A100136 KEYWORD easy,nonn AUTHOR Paul Barry, Nov 06 2004 STATUS approved

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Last modified May 28 21:37 EDT 2020. Contains 334690 sequences. (Running on oeis4.)