id:A020865 - OEIS Search Results

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A020865

Number of forests in Moebius ladder M_n.

+0
1

0, 4, 38, 328, 2686, 21224, 163982, 1249784, 9447102, 71056840, 532854638, 3988597144, 29822927134, 222836912744, 1664351910350, 12427793513528, 92784673372542, 692656225953544, 5170521713987630 (list; graph; listen)

	OFFSET	`0,2`
	REFERENCES	`J. P. McSorley, Counting structures in the Moebius ladder, Discrete Math., 184 (1998), 137-164.`
	FORMULA	`(4+sqrt(12))^n+(4-sqrt(12))^n+2^n-(5/2+1/2sqrt(17))^n-(5/2-1/2sqrt(17))^n-1.`
	CROSSREFS	`Sequence in context: A003633 A129310 A092642 this_sequence A120974 A113664 A077745` `Adjacent sequences: A020862 A020863 A020864 this_sequence A020866 A020867 A020868`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

AT&T Labs Research