%I #13 Nov 27 2022 10:30:24
%S 1,21,408,6410,113748,2002405,35669433,633099244,11240647480,
%T 199480271184,3540336868535,62831861216325,1115122033297714,
%U 19790829247392636,351241699540793996,6233729269914805533,110634310753645173365,1963503651093439655818,34847658208568166865562,618465506517313482341986
%N Number of self-avoiding closed paths in the 7 X n grid graph which pass through all vertices on four (left, right, upper, lower) sides of the graph.
%H Seiichi Manyama, <a href="/A358698/b358698.txt">Table of n, a(n) for n = 2..50</a>
%Y Row 7 of A333758.
%K nonn
%O 2,2
%A _Seiichi Manyama_, Nov 27 2022