A241585 Number of orbits of Sym(n)^2 under action of Iso_1*(n).

1, 3, 8, 28, 93, 425, 2151, 14016

Offset

1,2

Links

Table of n, a(n) for n=1..8.

Mathieu Bogaerts and Peter Dukes, Semidefinite programming for permutation codes, Discrete Math. 326 (2014), 34--43. MR3188985.

Formula

Proposition 3.3 of Bogaerts et al. gives an explicit formula.

Crossrefs

Cf. A241584, A110143.

Sequence in context: A148855 A148856 A151482 * A273162 A148857 A148858

Adjacent sequences: A241582 A241583 A241584 * A241586 A241587 A241588

Keyword

nonn,more

Author

N. J. A. Sloane, May 12 2014

Status

approved