id:A049680 - OEIS Search Results

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a(n)=(L(n)+L(2n))/2, where L=A000032 (the Lucas sequence).

+0
2

2, 2, 5, 11, 27, 67, 170, 436, 1127, 2927, 7625, 19901, 52002, 135982, 355745, 930931, 2436527, 6377807, 16695530, 43706576, 114420627, 299549527, 784218605, 2053091161, 5375030402, 14071960442, 36840786845, 96450296411 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`Binomial transform of trace(A^n)/4, where A is the adjacency matrix of path graph P_4 (A005248 with interpolated zeros). - Paul Barry (pbarry(AT)wit.ie), Apr 24 2004`
	CROSSREFS	`Sequence in context: A078405 A109278 A112527 this_sequence A058021 A077182 A085289` `Adjacent sequences: A049677 A049678 A049679 this_sequence A049681 A049682 A049683`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research