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 A220742 Number of ways to reciprocally link elements of an 5Xn array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links 1
 1, 16, 258, 5760, 127288, 2792479, 60293428, 1311676964, 28429050419, 616803551956, 13375959455328, 290134376125496, 6292641300928077, 136484527133796904, 2960239399141332140, 64205688074746437957 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 5 of A220738 LINKS R. H. Hardin, Table of n, a(n) for n = 1..209 EXAMPLE Some solutions for n=3 0=self 1=nw 3=ne 4=w 6=e 7=sw 9=se (reciprocal directions total 10) .00.69.47...69.47.00...00.67.47...00.67.47...00.00.00...69.47.00...00.69.47 .00.36.14...39.16.47...39.36.47...36.34.00...00.00.00...39.16.47...69.34.17 .00.79.00...00.13.00...00.13.00...00.79.00...00.00.00...00.13.00...00.13.00 .39.00.17...69.49.00...00.67.47...36.47.17...00.69.47...00.00.00...00.67.47 .00.13.00...00.16.14...36.34.00...36.34.00...00.36.14...00.00.00...36.34.00 CROSSREFS Sequence in context: A363689 A041482 A320362 * A266023 A223623 A264532 Adjacent sequences: A220739 A220740 A220741 * A220743 A220744 A220745 KEYWORD nonn AUTHOR R. H. Hardin Dec 18 2012 STATUS approved

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Last modified December 3 22:01 EST 2023. Contains 367540 sequences. (Running on oeis4.)