A308141 - OEIS

%I #6 Feb 16 2025 08:33:55

%S 0,4,756,11197440,25328684620800,14303252551164700262400,

%T 2979637719108524426779310260224000

%N Number of (undirected) Hamiltonian paths in the n X n rook graph.

%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HamiltonianPath.html">Hamiltonian Path</a>

%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/RookGraph.html">Rook Graph</a>

%F a(n) = A096970(n)/2.

%Y Cf. A096970.

%K nonn,hard,more

%O 1,2

%A _Eric W. Weisstein_, May 14 2019