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, 85, 2276, 78418, 2792479, 94226589, 3287610473, 113721332657, 3938053379575, 136391275221050, 4722786906754895, 163558767077415021, 5664109467155941888, 196151416904655312336, 6792842076330880392087, 235240039699005021696465

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