A301956 Number of 7Xn 0..1 arrays with every element equal to 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.

0, 233, 5820, 439078, 21418808, 1427656268, 86143630040, 5308792667591, 324469928188515, 19912146679826809, 1220249427475855637, 74810226305531953416, 4585754748793488994754, 281114995706301373466905

Offset

1,2

Comments

Row 7 of A301951.

Links

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

Example

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

Crossrefs

Cf. A301951.

Sequence in context: A250464 A221812 A219065 * A220567 A201035 A189454

Adjacent sequences: A301953 A301954 A301955 * A301957 A301958 A301959

Keyword

nonn

Author

R. H. Hardin, Mar 29 2018

Status

approved