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A341498
Number of Hamiltonian cycles in the 3 X n rook graph.
2
1, 3, 48, 1566, 126120, 18153720, 4357332000, 1619499374640, 883124275824000, 677267024315091840, 706022078404964428800, 972890835488032591468800, 1731258722423272253052441600, 3900512495412914495014418918400, 10938873545450798558110852249497600
OFFSET
1,2
LINKS
CROSSREFS
Column 3 of A269562.
Sequence in context: A199012 A304208 A300871 * A201698 A356612 A295813
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Feb 21 2021
STATUS
approved