id:A030436 - OEIS Search Results

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Expansion of (1+x-2*x^2-x^3)/(1-4*x^2+2x^4).

+0
6

1, 1, 2, 3, 6, 10, 20, 34, 68, 116, 232, 396, 792, 1352, 2704, 4616, 9232, 15760, 31520, 53808, 107616, 183712, 367424, 627232, 1254464, 2141504, 4283008, 7311552, 14623104, 24963200, 49926400, 85229696 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Also (starting 3,6,...) the number of zig-zag paths from top to bottom of a rectangle of width 7 whose color is not that of the top right corner.`
	LINKS	`Joseph Myers, BMO 2008-2009 Round 1 Problem 1 - Generalifation`
	CROSSREFS	`a(n)=A030435(n)/2. a(2n)=A006012(n). a(2n+1)=A007052(n).` `a(n) = A094718(7, n).` `Sequence in context: A050291 A135452 A077027 this_sequence A030227 A061551 A026034` `Adjacent sequences: A030433 A030434 A030435 this_sequence A030437 A030438 A030439`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`Comment and link added and typo in cross-reference corrected by Joseph Myers (jsm(AT)polyomino.org.uk), Dec 24 2008`

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Last modified November 25 14:45 EST 2009. Contains 167481 sequences.

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