A341498 Number of Hamiltonian cycles in the 3 X n rook graph.

1, 3, 48, 1566, 126120, 18153720, 4357332000, 1619499374640, 883124275824000, 677267024315091840, 706022078404964428800, 972890835488032591468800, 1731258722423272253052441600, 3900512495412914495014418918400, 10938873545450798558110852249497600

Offset

1,2

Links

Andrew Howroyd, Table of n, a(n) for n = 1..30

Crossrefs

Column 3 of A269562.

Sequence in context: A199012 A304208 A300871 * A201698 A356612 A295813

Adjacent sequences: A341495 A341496 A341497 * A341499 A341500 A341501

Keyword

nonn

Author

Andrew Howroyd, Feb 21 2021

Status

approved