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%I #7 Jan 27 2022 23:05:26
%S 1,717,114900,21914482,4067687187,759141297226,141539684300104,
%T 26392338517041335,4921196474806555320,917624537292862421240,
%U 171103547699638196272026,31904579896557581955181967
%N Number of ways to reciprocally link elements of an n X 7 array either to themselves or to exactly two horizontal, diagonal or antidiagonal neighbors.
%C Column 7 of A220725.
%H R. H. Hardin, <a href="/A220724/b220724.txt">Table of n, a(n) for n = 1..151</a>
%e Some solutions for n=3 0=self 1=nw 3=ne 4=w 6=e 7=sw 9=se (reciprocal directions total 10)
%e .00.67.47.00.00.79.00...00.67.49.00.67.46.47...00.67.47.69.46.46.47
%e .36.34.67.49.37.79.17...36.46.47.13.00.39.00...39.37.00.00.17.36.47
%e .00.36.46.34.13.36.14...00.36.46.46.46.46.14...36.14.00.36.46.34.00
%Y Cf. A220725.
%K nonn
%O 1,2
%A _R. H. Hardin_, Dec 18 2012
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