A241584 Number of orbits of Sym(n)^2 under action of Iso_1(n).

1, 4, 11, 43, 155, 761, 4043, 27190

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 3.2 of Bogaerts et al. gives an explicit formula.

Crossrefs

Cf. A241585, A110143.

Sequence in context: A163133 A176574 A323792 * A176576 A110143 A149279

Adjacent sequences: A241581 A241582 A241583 * A241585 A241586 A241587

Keyword

nonn,more

Author

N. J. A. Sloane, May 12 2014

Status

approved