id:A001354 - OEIS Search Results

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Coordination sequence for hyperbolic tesselation 3^7 (from triangle group (2,3,7)).

+0
2

1, 7, 21, 56, 147, 385, 1008, 2639, 6909, 18088, 47355, 123977, 324576, 849751, 2224677, 5824280, 15248163, 39920209, 104512464, 273617183, 716339085, 1875400072, 4909861131, 12854183321 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n+1)=3*a(n)-a(n-1).`
	CROSSREFS	`7 times alternate Fibonacci numbers A001906.` `Sequence in context: A146408 A050894 A146464 this_sequence A088656 A146139 A083596` `Adjacent sequences: A001351 A001352 A001353 this_sequence A001355 A001356 A001357`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

AT&T Labs Research