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A005312 Number of symmetric anti-Hadamard matrices of order n.
(Formerly M2659) 		+0
1
1, 3, 7, 16, 46, 138 (list; graph; listen)
OFFSET

1,2
REFERENCES

R. L. Graham and N. J. A. Sloane, Anti-Hadamard matrices, Linear Alg. Applic., 62 (1984), 113-137.

CROSSREFS

Sequence in context: A058300 A000674 A129045 this_sequence A000963 A133593 A087749

Adjacent sequences: A005309 A005310 A005311 this_sequence A005313 A005314 A005315

KEYWORD

nonn

AUTHOR

njas

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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