A309669 Number of ways of placing 2*n-1 nonattacking queens on a hexagonal board with edge-length n in Glinski's hexagonal chess, inequivalent up to rotations and reflections of the board.

1, 0, 0, 1, 0, 0, 0, 1, 0, 3, 0, 7, 30, 133, 581

Offset

1,10

Links

Table of n, a(n) for n=1..15.

Chess variants, Glinski's Hexagonal Chess

Vaclav Kotesovec, All inequivalent solutions for n = 4, 8, 10 and 12

Wikipedia, Hexagonal chess - Gliński's hexagonal chess

Crossrefs

Cf. A309260, A309746.

Sequence in context: A198488 A296364 A071296 * A013450 A013421 A011081

Adjacent sequences: A309666 A309667 A309668 * A309670 A309671 A309672

Keyword

nonn,more

Author

Vaclav Kotesovec, Aug 16 2019

Extensions

a(15) from Vaclav Kotesovec, Aug 28 2019

Status

approved