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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
1, 344, 59846, 8627817, 1233993907, 179768901595, 26120030149221, 3794284713986274, 551211422624758246, 80077716613058174101, 11633298013349256569296, 1690028849150702328710965 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 5 of A220652
LINKS
EXAMPLE
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)
.68.49.67.46.48...69.47.00.69.47...00.68.49.00.00...00.78.79.67.48
.28.39.17.78.27...36.14.68.34.18...68.24.78.17.00...38.23.37.18.28
.26.34.13.23.00...00.00.26.46.24...26.34.23.00.00...26.34.00.26.24
CROSSREFS
Sequence in context: A185746 A202904 A086028 * A178191 A172934 A172952
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 17 2012
STATUS
approved

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Last modified May 25 12:29 EDT 2024. Contains 372788 sequences. (Running on oeis4.)