A086262 Number of n X n conference matrices (including both symmetric and antisymmetric).

1, 4, 0, 16, 0, 384, 0, 30720, 0, 2580480, 0, 1486356480, 0

Offset

1,2

Comments

a(n) = A086260(n) + A086261(n) for n>1.

Links

Table of n, a(n) for n=1..13.

Eric Weisstein's World of Mathematics, C-Matrix

Crossrefs

Cf. A086260, A086261.

Sequence in context: A199572 A003195 A190759 * A167361 A321610 A167314

Adjacent sequences: A086259 A086260 A086261 * A086263 A086264 A086265

Keyword

nonn,more

Author

Eric W. Weisstein, Jul 14 2003

Extensions

a(9)-a(13) from Martin Ehrenstein, Oct 08 2021

Status

approved