id:A057411 - OEIS Search Results

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Number of staircase polygons of perimeter 2n with 2 (staircase polygon) holes on square lattice (not allowing rotations).

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2, 54, 737, 7330, 60362, 438284, 2908069, 18032906, 106088843, 598428100, 3261717223, 17278076588, 89351738840, 452686823796, 2253216812878, 11043624323310, 53399946187312, 255135202590382, 1206067676613670 (list; graph; listen)

	OFFSET	`12,1`
	LINKS	`I. Jensen, Table of n, a(n) for n = 12..75 (from link below)` `I. Jensen, More terms`
	CROSSREFS	`Sequence in context: A078691 A113028 A055024 this_sequence A157058 A071798 A123686` `Adjacent sequences: A057408 A057409 A057410 this_sequence A057412 A057413 A057414`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Aug 30 2000`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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