id:A054881 - OEIS Search Results

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Number of walks of length n along the edges of an octahedron starting and ending at a vertex, and also ( with a(0)=0 ) between two opposite vertices.

+0
4

1, 0, 4, 8, 48, 160, 704, 2688, 11008, 43520, 175104, 698368, 2797568, 11182080, 44744704, 178946048, 715849728, 2863267840, 11453333504, 45812809728, 183252287488, 733007052800, 2932032405504, 11728121233408 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`G.f.: 1/2+1/3/(1+2t)-1/6/(4t-1). a(n)=(4^n+(-1)^n*2^(n+1))/6 for n>0`
	CROSSREFS	`{a(n)/4} for k>0 is A003683.` `Sequence in context: A002470 A087261 A078236 this_sequence A076687 A045882 A051681` `Adjacent sequences: A054878 A054879 A054880 this_sequence A054882 A054883 A054884`
	KEYWORD	`nonn,walk`
	AUTHOR	`Paolo Dominici (pl.dm(AT)libero.it), May 23 2000`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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