id:A124400 - OEIS Search Results

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a(0)=1, a(1)=1, a(2)=4, a(3)=7, a(n)=a(n-1)+3*a(n-2)-a(n-4) for n>=4.

+0
17

1, 1, 4, 7, 18, 38, 88, 195, 441, 988, 2223, 4992, 11220, 25208, 56645, 127277, 285992, 642615, 1443946, 3244514, 7290360, 16381287, 36808421, 82707768, 185842671, 417584688, 938304280, 2108350576, 4737420745, 10644887785, 23918845740 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Unsigned version of A077920.`
	FORMULA	`G.f.: 1/(1-x-3*x^2+x^4).`
	CROSSREFS	`Sequence in context: A056318 A011948 A146387 this_sequence A077920 A135582 A100828` `Adjacent sequences: A124397 A124398 A124399 this_sequence A124401 A124402 A124403`
	KEYWORD	`easy,nonn`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 14 2006`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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