A057982 - OEIS

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A057982

Number of singular n X n (-1,1)-matrices.

0, 8, 320, 43264, 22003712, 43090149376, 326720427917312, 9588057159626653696, 1086099857128493963804672 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`a(n)=2^(2n-1)*A046747(n-1). - Kevin Costello, May 18 2005`
	LINKS	`Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.`
	CROSSREFS	`Cf. A056990.` `Complement of A056990.` `Cf. A046747.` `Sequence in context: A193812 A081980 A079504 * A041769 A171248 A204069` `Adjacent sequences: A057979 A057980 A057981 * A057983 A057984 A057985`
	KEYWORD	`nonn,more`
	AUTHOR	`Eric Weisstein (eric(AT)weisstein.com), Oct 23 2000.`
	EXTENSIONS	`More terms from Kevin Costello, May 18 2005` `a(6)-a(9) from Herman Jamke (hermanjamke(AT)fastmail.fm), Apr 18 2008`

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.