A341499 Number of Hamiltonian cycles in the 4 X n rook graph.
3, 30, 1566, 284112, 122330880, 112777827840, 196166156901120, 593448176589649920, 2927894041560795955200, 22384255485528968471838720, 254368264421726727280223846400, 4150617533254451866274537825894400, 94460232869419006706028435289512345600
Offset: 1
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Crossrefs
Column 4 of A269562.