A298835 Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.

0, 1, 9, 110, 18075, 5918418, 7844725524, 33608679844048, 476321271854010112

Offset

1,3

Comments

Diagonal of A298841.

Links

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

Example

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

Crossrefs

Cf. A298841.

Sequence in context: A053894 A053904 A058607 * A082723 A352384 A143167

Adjacent sequences: A298832 A298833 A298834 * A298836 A298837 A298838

Keyword

nonn

Author

R. H. Hardin, Jan 27 2018

Status

approved