id:A103143 - OEIS Search Results

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a(n)=a(n-1)+a(n-2)+3a(n-3).

+0
2

1, 1, 2, 6, 11, 23, 52, 108, 229, 493, 1046, 2226, 4751, 10115, 21544, 45912, 97801, 208345, 443882, 945630, 2014547, 4291823, 9143260, 19478724, 41497453, 88405957, 188339582, 401237898, 854795351, 1821051995, 3879561040 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Diagonal sums of the Pascal-(1,3,1) triangle A081578.`
	FORMULA	`G.f.: 1/(1-x-x^2-3x^3)`
	CROSSREFS	`Cf. A077947.` `Sequence in context: A005999 A102429 A080012 this_sequence A005673 A084308 A067605` `Adjacent sequences: A103140 A103141 A103142 this_sequence A103144 A103145 A103146`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 24 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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