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A220736 Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links 1
1, 85, 2276, 78418, 2792479, 94226589, 3287610473, 113721332657, 3938053379575, 136391275221050, 4722786906754895, 163558767077415021, 5664109467155941888, 196151416904655312336, 6792842076330880392087, 235240039699005021696465 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A220738

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

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

.00.00.79.00.69.47...00.67.47.79.00.00...00.00.00.00.69.47...00.79.67.49.69.47

.00.36.47.17.39.17...39.39.39.69.14.00...00.00.00.69.34.17...36.34.17.79.13.17

.00.36.34.00.36.14...00.16.14.16.14.00...00.00.00.00.13.00...00.36.34.00.13.00

CROSSREFS

Sequence in context: A163692 A221339 A262062 * A157110 A076463 A281162

Adjacent sequences:  A220733 A220734 A220735 * A220737 A220738 A220739

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 18 2012

STATUS

approved

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Last modified October 16 20:36 EDT 2021. Contains 348047 sequences. (Running on oeis4.)