A299215 Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 5, 22, 427, 21730, 3096833, 1226106440, 1213390065190, 3070232362267950

Offset

1,2

Comments

Diagonal of A299221.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A299221.

Sequence in context: A005632 A183408 A298322 * A300031 A271678 A002069

Adjacent sequences: A299212 A299213 A299214 * A299216 A299217 A299218

Keyword

nonn

Author

R. H. Hardin, Feb 05 2018

Status

approved