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%I #15 Dec 26 2020 02:42:11
%S 1,5640,1269684,295671198,93391009587,26971800950170,7621726574570613,
%T 2176852129116199068,621423541447699842468,177129811732376379317558,
%U 50496098726203776039975335,14395928063309130831417237704,4103904494029399087473676726278
%N Number of Hamiltonian circuits within parallelograms of size 9 X n on the triangular lattice.
%H Seiichi Manyama, <a href="/A339961/b339961.txt">Table of n, a(n) for n = 2..50</a>
%H Olga Bodroža-Pantić, Harris Kwong and Milan Pantić, <a href="https://doi.org/10.1016/j.dam.2015.07.028">Some new characterizations of Hamiltonian cycles in triangular grid graphs</a>, Discrete Appl. Math. 201 (2016) 1-13. (a(n) is equal to h8(n-1) defined by this paper)
%H M. Peto, <a href="https://doi.org/10.31274/rtd-180813-17105">Studies of protein designability using reduced models</a>, Thesis, 2007.
%Y Row 9 of A339849.
%Y Cf. A160149.
%K nonn
%O 2,2
%A _Seiichi Manyama_, Dec 25 2020
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