A298828 Number of n X n 0..1 arrays with every element equal to 1, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.

0, 4, 1, 68, 1590, 16551, 5097700, 2031564141, 1185589525594

Offset

1,2

Comments

Diagonal of A298834.

Links

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

Example

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

Crossrefs

Cf. A298834.

Sequence in context: A338681 A069740 A173008 * A114917 A100864 A295178

Adjacent sequences: A298825 A298826 A298827 * A298829 A298830 A298831

Keyword

nonn

Author

R. H. Hardin, Jan 27 2018

Status

approved