A298884 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 6 or 8 king-move adjacent elements, with upper left element zero.

0, 3, 15, 40, 123, 516, 1818, 7768, 41048, 242083, 1483959, 10171555

Offset

1,2

Comments

Diagonal of A298888.

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=7
..0..1..0..1..0..0..0. .0..1..1..0..0..1..1. .0..0..1..0..0..1..1
..1..0..0..1..1..1..1. .1..0..0..0..0..0..0. .1..0..1..1..1..0..0
..0..0..0..1..1..1..0. .1..0..0..0..1..0..1. .0..1..0..1..0..1..0
..0..0..1..1..1..1..0. .0..0..0..0..1..1..0. .0..1..1..1..1..1..1
..0..1..0..1..1..1..1. .0..0..1..1..0..1..0. .1..0..1..1..1..0..0
..0..0..1..1..0..0..0. .1..0..0..1..1..0..1. .1..0..1..1..1..0..1
..1..1..0..0..1..1..1. .1..0..1..0..0..1..0. .1..0..1..0..0..1..0

Crossrefs

Cf. A298888.

Sequence in context: A297621 A014309 A298049 * A298655 A299608 A249835

Adjacent sequences: A298881 A298882 A298883 * A298885 A298886 A298887

Keyword

nonn

Author

R. H. Hardin, Jan 28 2018

Status

approved