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A087487
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4*(2^(n^2-n+1)*(n^2-n)-n+3).
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0
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8, 68, 3072, 393212, 167772152, 257698037748, 1477743627730928, 32281802128991715308, 2720083094132915643088872, 891316828285473797927369441252, 1142305308877662078276709192428421088, 5749410871496176278677177367167155700760540, 113997127711810427619887416951870075533162738352088
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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REFERENCES
| A. J. Hoffman, On eigenvalues of symmetric (+1, -1) matrices, Israel J. Math., 17 (1974), 69-75 (MR 50#2202).
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MATHEMATICA
| f[n_]:=Module[{n2n=n^2-n}, 4 (2^(n2n+1) n2n-n+3)]; Array[f, 15] (* From Harvey P. Dale, Mar 24 2011 *)
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CROSSREFS
| Sequence in context: A113357 A030992 A091590 * A178368 A152279 A015575
Adjacent sequences: A087484 A087485 A087486 * A087488 A087489 A087490
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Oct 24 2003
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