id:A153338 - OEIS Search Results

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Number of zig-zag paths from top to bottom of a 2n-1 by 2n-1 square whose color is not that of the top right corner

+0
5

0, 2, 18, 116, 650, 3372, 16660, 79592, 371034, 1697660, 7654460, 34106712, 150499908, 658707896, 2863150440, 12371226064, 53178791162, 227561427612, 969890051884, 4119092850680, 17438036501676, 73611934643368 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Joseph Myers, BMO 2008--2009 Round 1 Problem 1---Generalisation`
	FORMULA	`a(n) = (n)2^(2n-2) - (2n-1)binomial(2n-2,n-1)`
	CROSSREFS	`A102699, A153334, A153335, A153336, A153337` `Sequence in context: A038721 A064837 A027433 this_sequence A007798 A058052 A119578` `Adjacent sequences: A153335 A153336 A153337 this_sequence A153339 A153340 A153341`
	KEYWORD	`easy,nonn`
	AUTHOR	`Joseph Myers (jsm(AT)polyomino.org.uk), Dec 24 2008`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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