Number of Seidel matrices of order 2n for which Cameron's first cohomology invariant is nonzero.
A263625
Number of Seidel matrices of order 2n for which Cameron's first cohomology invariant is nonzero.
Terms
- a(0) =0a(1) =0a(2) =2a(3) =21a(4) =392a(5) =15274
External references
- oeis: A263625