A220686 - OEIS

%I #4 Dec 17 2012 19:23:58

%S 1,351,46027,6349886,822649205,107713940118,14108684022136,

%T 1848014307847883,242044667782801540,31702119421997470360,

%U 4152232349834304063419,543844751860183504221026

%N Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two horizontal, vertical or antidiagonal neighbors

%C Column 6 of A220688

%H R. H. Hardin, <a href="/A220686/b220686.txt">Table of n, a(n) for n = 1..210</a>

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

%e .00.67.46.46.46.48...00.00.68.48.00.00...00.67.46.46.46.48...68.46.47.68.46.48

%e .38.67.46.47.78.28...00.00.26.24.68.47...36.46.47.00.67.24...26.34.00.26.48.27

%e .23.00.36.34.26.24...00.00.00.00.23.00...00.36.46.34.00.00...00.00.00.00.23.00

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 17 2012