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A263625
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Number of Seidel matrices of order 2n for which Cameron's first cohomology invariant is nonzero.
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0
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OFFSET
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1,3
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LINKS
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Table of n, a(n) for n=1..6.
G. Greaves, J. H. Koolen, A. Munemasa, F. Szöllősi, Equiangular lines in Euclidean spaces, arXiv:1403.2155 [math.CO], 2014.
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CROSSREFS
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Sequence in context: A098344 A228384 A216281 * A245686 A091315 A087546
Adjacent sequences: A263622 A263623 A263624 * A263626 A263627 A263628
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane, Oct 24 2015
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STATUS
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approved
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