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%I #11 Dec 25 2020 10:50:38
%S 1,18980,8782833,4190083085,2848083212818,1738936046774850,
%T 1033232532941136255,621423541447699842468,373334515946952014204102,
%U 223802065032649969887333948,134170413630013820290109500226,80436114451156297907062202392494,48216986287603185632341666866663007
%N Number of Hamiltonian circuits within parallelograms of size 10 X n on the triangular lattice.
%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 h9(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 10 of A339849.
%Y Cf. A180504.
%K nonn
%O 2,2
%A _Seiichi Manyama_, Dec 25 2020