A003155 - OEIS

This site is supported by donations to The OEIS Foundation.

A003155

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

1, 1, 1, 6, 15, 255, 1897, 92263, 1972653, 213207210 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,4`
	REFERENCES	`M. Gardner, The Unexpected Hanging and Other Mathematical Diversions. Simon and Schuster, NY, 1969, p. 189.` `N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).`
	LINKS	`Illustration showing ways to quarter a 6x6 board`
	CROSSREFS	`Cf. A003213, A006067.` `Sequence in context: A013224 A013230 A117062 * A199095 A024081 A145558` `Adjacent sequences: A003152 A003153 A003154 * A003156 A003157 A003158`
	KEYWORD	`nonn,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

Content is available under The OEIS End-User License Agreement .

Last modified February 16 20:23 EST 2012. Contains 205962 sequences.