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%I #14 Dec 08 2020 17:14:27
%S 28,1664,114069,5948291,279285399,12947640143,603841648931,
%T 28251882697663,1322310119854705,61875355046353061,
%U 2895006802805407868,135448608195945754204,6337277838067727854392,296505504331623399871908,13872765058478362509835979,649072483984291902586660423
%N Number of cycles in the grid graph P_8 X P_n.
%H Andrew Howroyd, <a href="/A339120/b339120.txt">Table of n, a(n) for n = 2..200</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/GraphCycle.html">Graph Cycle</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/GridGraph.html">Grid Graph</a>
%Y Cf. A140517, A145418, A231829.
%K nonn
%O 2,1
%A _Seiichi Manyama_, Nov 24 2020
%E Terms a(10) and beyond from _Andrew Howroyd_, Dec 08 2020
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