%I #10 Feb 16 2025 08:33:55
%S 0,0,1,21,7536,29163712,1616695637120,1457789611468301056
%N Number of (undirected) Hamiltonian cycles in the n-triangular honeycomb bishop graph.
%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HamiltonianCycle.html">Hamiltonian Cycle</a>
%Y Cf. A290774, A290782, A308145.
%K nonn,hard,more,changed
%O 1,4
%A _Eric W. Weisstein_, May 06 2019
%E a(8) from _Andrew Howroyd_, Feb 10 2020