id:A003155 - OEIS Search Results

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Number of ways to halve an n X n chessboard.
(Formerly M4111)

+0
1

1, 1, 1, 6, 15, 255, 1897, 92263, 1972653, 213207210 (list; graph; listen)

	OFFSET	`1,4`
	REFERENCES	`N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).` `M. Gardner, The Unexpected Hanging and Other Mathematical Diversions. Simon and Schuster, NY, 1969, p. 189.`
	LINKS	`Illustration showing ways to quarter a 6x6 board`
	CROSSREFS	`Cf. A003213, A006067.` `Sequence in context: A013224 A013230 A117062 this_sequence A024081 A145558 A145612` `Adjacent sequences: A003152 A003153 A003154 this_sequence A003156 A003157 A003158`
	KEYWORD	`nonn,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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