%I #10 Aug 05 2023 21:26:09
%S 1,16,3360,9371648,347950546944,172066422921363456,
%T 1133503548832944876421120
%N The number of stones-and-bones tilings of the (3n-1,3n)-benzel when one orientation of bone is forbidden.
%C See Problem 11 of the Propp article. It is conjectured that a(n) is 2-adically continuous as a function of n.
%H James Propp, <a href="https://arxiv.org/abs/2206.06472">Trimer covers in the triangular grid: twenty mostly open problems</a>, arXiv:2206.06472 [math.CO], 2022.
%Y Cf. A352207, A364481, A364482, A364416, A364417, A364418, A364438.
%K nonn,more
%O 1,2
%A _James Propp_, Jul 26 2023