A299548 Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

0, 1, 9, 220, 37283, 19604624, 40708113490, 303433045764806, 8209941324439372141

Offset

1,3

Comments

Diagonal of A299554.

Links

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

Example

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

Crossrefs

Cf. A299554.

Sequence in context: A368632 A371684 A157692 * A079913 A368704 A205578

Adjacent sequences: A299545 A299546 A299547 * A299549 A299550 A299551

Keyword

nonn

Author

R. H. Hardin, Feb 12 2018

Status

approved