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.

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

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