A301614 Number of nX7 0..1 arrays with every element equal to 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

8, 1172, 72758, 4422826, 271301458, 16632517333, 1019565752074, 62500458737127, 3831336753439723, 234864521959895889, 14397413152054371201, 882574864133207632568, 54102660842288578973363, 3316543531108585833444946

Offset

1,1

Comments

Column 7 of A301615.

Links

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

Example

Some solutions for n=5
..0..0..0..1..1..0..0. .0..0..0..0..1..1..1. .0..0..0..1..1..0..0
..0..0..1..1..1..1..1. .0..0..1..0..1..0..0. .0..0..1..0..1..0..0
..0..0..1..0..0..1..1. .0..0..1..0..1..0..1. .0..0..1..0..0..1..0
..0..0..1..1..1..0..1. .0..0..1..0..0..1..1. .0..0..1..0..0..1..1
..0..0..0..1..0..0..0. .0..0..0..0..0..1..1. .0..0..0..1..1..1..1

Crossrefs

Cf. A301615.

Sequence in context: A221084 A117084 A201985 * A180767 A240399 A160008

Adjacent sequences: A301611 A301612 A301613 * A301615 A301616 A301617

Keyword

nonn

Author

R. H. Hardin, Mar 24 2018

Status

approved