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A220730 Number of ways to reciprocally link elements of an 6Xn array either to themselves or to exactly two horizontal, diagonal or antidiagonal neighbors 1
1, 32, 2275, 331589, 42378036, 5717794568, 759141297226, 101519188093819, 13544010607777037, 1808631116741400544, 241439736338645879892, 32234631644593961566460, 4303448709056159145198981 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 6 of A220725

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..41

EXAMPLE

Some solutions for n=3 0=self 1=nw 3=ne 4=w 6=e 7=sw 9=se (reciprocal directions total 10)

.69.46.47...69.47.00...00.79.00...00.00.00...00.67.47...00.79.00...00.00.00

.00.13.00...36.14.00...36.47.17...00.67.47...39.37.00...39.67.14...69.46.47

.00.67.47...00.79.00...39.37.00...39.37.00...36.14.00...36.14.00...00.13.00

.39.39.00...39.00.17...39.19.00...39.17.00...00.69.47...00.00.00...69.46.47

.00.16.14...00.13.00...00.16.14...39.16.47...00.39.17...00.00.00...00.13.00

.00.00.00...00.00.00...00.00.00...00.13.00...00.36.14...00.00.00...00.00.00

CROSSREFS

Sequence in context: A321663 A264145 A180954 * A254458 A185968 A247999

Adjacent sequences:  A220727 A220728 A220729 * A220731 A220732 A220733

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 18 2012

STATUS

approved

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Last modified September 20 12:05 EDT 2021. Contains 347586 sequences. (Running on oeis4.)