id:A087487 - OEIS Search Results

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4*(2^(n^2-n+1)*(n^2-n)-n+3).

+0
1

8, 68, 3072, 393212, 167772152, 257698037748, 1477743627730928, 32281802128991715308, 2720083094132915643088872, 891316828285473797927369441252, 1142305308877662078276709192428421088, 5749410871496176278677177367167155700760540, 113997127711810427619887416951870075533162738352088 (list; graph; listen)

	OFFSET	`0,1`
	REFERENCES	`A. J. Hoffman, On eigenvalues of symmetric (+1, -1) matrices, Israel J. Math., 17 (1974), 69-75 (MR 50#2202).`
	CROSSREFS	`Sequence in context: A113357 A030992 A091590 this_sequence A152279 A015575 A152109` `Adjacent sequences: A087484 A087485 A087486 this_sequence A087488 A087489 A087490`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Oct 24 2003`

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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.

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