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A220686 Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two horizontal, vertical or antidiagonal neighbors 1
1, 351, 46027, 6349886, 822649205, 107713940118, 14108684022136, 1848014307847883, 242044667782801540, 31702119421997470360, 4152232349834304063419, 543844751860183504221026 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 6 of A220688
LINKS
EXAMPLE
Some solutions for n=3 0=self 2=n 3=ne 4=w 6=e 7=sw 8=s (reciprocal directions total 10)
.00.67.46.46.46.48...00.00.68.48.00.00...00.67.46.46.46.48...68.46.47.68.46.48
.38.67.46.47.78.28...00.00.26.24.68.47...36.46.47.00.67.24...26.34.00.26.48.27
.23.00.36.34.26.24...00.00.00.00.23.00...00.36.46.34.00.00...00.00.00.00.23.00
CROSSREFS
Sequence in context: A231707 A220333 A221294 * A167820 A145633 A252250
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 17 2012
STATUS
approved

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Last modified May 22 19:06 EDT 2024. Contains 372758 sequences. (Running on oeis4.)