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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
 1, 169, 4604, 220299, 9973284, 455249977, 21051034046, 969333059888, 44710643494095, 2061425679292684, 95053260696179636, 4382893797173364311, 202094068495963167552, 9318534371184411614287, 429675728242919953910812 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 6 of A220681 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 EXAMPLE Some solutions for n=3 0=self 2=n 3=ne 4=w 6=e 7=sw 8=s (reciprocal directions total 10) .00.78.00.00.67.48...00.68.47.78.68.47...00.00.68.47.67.48...00.78.78.00.00.00 .36.24.68.34.78.27...00.23.38.27.23.78...68.47.23.38.67.24...38.23.27.78.00.78 .00.00.26.34.23.00...00.00.23.00.36.24...23.00.00.23.00.00...26.34.36.24.36.24 CROSSREFS Sequence in context: A156160 A264261 A232002 * A201092 A264363 A232313 Adjacent sequences: A220676 A220677 A220678 * A220680 A220681 A220682 KEYWORD nonn AUTHOR R. H. Hardin Dec 17 2012 STATUS approved

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Last modified June 14 12:37 EDT 2024. Contains 373400 sequences. (Running on oeis4.)