id:A030518 - OEIS Search Results

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Number of walks of length n between two vertices on a icosahedron at distance 2.

+0
3

0, 2, 8, 52, 248, 1302, 6448, 32552, 162448, 813802, 4067448, 20345052, 101717448, 508626302, 2543092448, 12715657552, 63578092448 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`A030517(n)=2A030517(n-1)+2A030518(n-1)+5A030517(n-2), A030518(n)=2A030517(n-1)+2A030518(n-1)+5A030518(n-2)` `a(n)=5^n/12-(-1)^n/12-(sqrt(5))^(n+1)/20-(-sqrt(5))^(n+1)/20. a(n)=4a(n-1)+10a(n-2)-20a(n-3)-25a(n-4). - Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 03 2004`
	CROSSREFS	`Sequence in context: A013085 A059429 A018987 this_sequence A123188 A027329 A136794` `Adjacent sequences: A030515 A030516 A030517 this_sequence A030519 A030520 A030521`
	KEYWORD	`nonn`
	AUTHOR	`Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp)`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

AT&T Labs Research