id:A086879 - OEIS Search Results

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Number of symmetric singular n X n matrices over GF(2).

+0
2

1, 4, 36, 576, 18880, 1208320, 155553792, 39821770752, 20417644331008, 20907667794952192, 42834024773286100992, 175448165471379869663232, 1437398154830976169705209856, 23550331368750713564450158280704 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = 2^(n*(n+1)/2) - A086812(n).`
	CROSSREFS	`Cf. A086812.` `Sequence in context: A073852 A139033 A001044 this_sequence A002761 A002084 A135867` `Adjacent sequences: A086876 A086877 A086878 this_sequence A086880 A086881 A086882`
	KEYWORD	`nonn`
	AUTHOR	`Yuval Dekel (dekelyuval(AT)hotmail.com), Sep 16 2003`
	EXTENSIONS	`More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Sep 19 2003`

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

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