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A350041
Number of ways of placing maximum number of nonattacking rooks on a triangular board with edge-length n (symmetric solutions count only once).
2
1, 1, 1, 1, 5, 3, 1, 45, 29, 6, 807, 422, 46, 20022, 8270, 424, 642162, 211848
OFFSET
1,5
COMMENTS
The rooks placements are considered different when they cannot be obtained by a rotation and/or reflection of another solution that leaves the board inchanged. - Alain Brobecker, Dec 19 2021
a(n) = A350191(n) for n <> 10,13,16,19,... - Vaclav Kotesovec, Dec 20 2021
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Alain Brobecker, Dec 10 2021
EXTENSIONS
a(17)-a(18) from Vaclav Kotesovec, Dec 19 2021
STATUS
approved