A297808 Number of n X n 0..1 arrays with every element equal to 2 or 3 king-move adjacent elements, with upper left element zero.

0, 1, 0, 8, 24, 83, 88, 838, 2234, 15799, 62938, 432302, 2162292, 14402163, 89993438, 752458227, 5948078028

Offset

1,4

Comments

Diagonal of A297814.

Links

Table of n, a(n) for n=1..17.

Example

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

Crossrefs

Cf. A297814.

Sequence in context: A146534 A180888 A296400 * A097544 A128688 A279162

Adjacent sequences: A297805 A297806 A297807 * A297809 A297810 A297811

Keyword

nonn

Author

R. H. Hardin, Jan 06 2018

Status

approved