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 A220650 Number of ways to reciprocally link elements of an nX5 array either to themselves or to exactly two king-move neighbors, without 3-loops 1

%I #4 Dec 17 2012 10:56:37

%S 1,344,59846,8627817,1233993907,179768901595,26120030149221,

%T 3794284713986274,551211422624758246,80077716613058174101,

%U 11633298013349256569296,1690028849150702328710965

%N Number of ways to reciprocally link elements of an nX5 array either to themselves or to exactly two king-move neighbors, without 3-loops

%C Column 5 of A220652

%H R. H. Hardin, <a href="/A220650/b220650.txt">Table of n, a(n) for n = 1..136</a>

%e Some solutions for n=3 0=self 1=nw 2=n 3=ne 4=w 6=e 7=sw 8=s 9=se (reciprocal directions total 10)

%e .68.49.67.46.48...69.47.00.69.47...00.68.49.00.00...00.78.79.67.48

%e .28.39.17.78.27...36.14.68.34.18...68.24.78.17.00...38.23.37.18.28

%e .26.34.13.23.00...00.00.26.46.24...26.34.23.00.00...26.34.00.26.24

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 17 2012

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