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A220679 Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without consecutive collinear links 1

%I #4 Dec 17 2012 16:01:24

%S 1,169,4604,220299,9973284,455249977,21051034046,969333059888,

%T 44710643494095,2061425679292684,95053260696179636,

%U 4382893797173364311,202094068495963167552,9318534371184411614287,429675728242919953910812

%N Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without consecutive collinear links

%C Column 6 of A220681

%H R. H. Hardin, <a href="/A220679/b220679.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 .00.78.00.00.67.48...00.68.47.78.68.47...00.00.68.47.67.48...00.78.78.00.00.00

%e .36.24.68.34.78.27...00.23.38.27.23.78...68.47.23.38.67.24...38.23.27.78.00.78

%e .00.00.26.34.23.00...00.00.23.00.36.24...23.00.00.23.00.00...26.34.36.24.36.24

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 17 2012

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Last modified July 14 03:51 EDT 2024. Contains 374291 sequences. (Running on oeis4.)