id:A153337 - 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 that of the top right corner

+0
5

1, 4, 24, 136, 720, 3624, 17584, 83024, 383904, 1746280, 7839216, 34812144, 153204064, 669108496, 2903267040, 12526343584, 53779871552, 229895033832, 978965187184, 4154438114480, 17575883030496, 74150192517808 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Joseph Myers, BMO 2008--2009 Round 1 Problem 1---Generalisation`
	FORMULA	`a(n) = (n)2^(2n-2) - 2(n-1)binomial(2n-2,n-1)`
	CROSSREFS	`A102699, A153334, A153335, A153336, A153338` `Sequence in context: A048180 A057391 A071079 this_sequence A122690 A005319 A155119` `Adjacent sequences: A153334 A153335 A153336 this_sequence A153338 A153339 A153340`
	KEYWORD	`easy,nonn`
	AUTHOR	`Joseph Myers (jsm(AT)polyomino.org.uk), Dec 24 2008`

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Last modified November 25 13:47 EST 2009. Contains 167481 sequences.

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