cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A206704 Number of Hadamard matrices of order 4n that are equivalent to their transpose.

Original entry on oeis.org

1, 1, 1, 3, 3, 12, 101, 3993
Offset: 1

Views

Author

Brendan McKay, Feb 11 2012

Keywords

Comments

Number of equivalence classes under row/column permutation and negation that contain the transpose.

Links

Crossrefs

Cf. A007299, A036297, A096201, A206705.

Formula

a(n) = 2*A096201(n) - A007299(n).

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.