A302380 Number of nX7 0..1 arrays with every element equal to 1, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

8, 2208, 127535, 8334338, 535192095, 34271733937, 2195619257236, 140685735128595, 9013655138528774, 577518643711241385, 37002236612561808562, 2370775298902153257752, 151898260084738496346512

Offset

1,1

Comments

Column 7 of A302381.

Links

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

Example

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

Crossrefs

Cf. A302381.

Sequence in context: A323588 A017415 A046246 * A303101 A302952 A151580

Adjacent sequences: A302377 A302378 A302379 * A302381 A302382 A302383

Keyword

nonn

Author

R. H. Hardin, Apr 06 2018

Status

approved