A299887 Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 5, 31, 1308, 135586, 55414033, 85265831295, 430615712168102, 7378237279248881087

Offset

1,2

Comments

Diagonal of A299893.

Links

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

Example

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

Crossrefs

Cf. A299893.

Sequence in context: A228647 A059301 A225158 * A088548 A244622 A278574

Adjacent sequences: A299884 A299885 A299886 * A299888 A299889 A299890

Keyword

nonn

Author

R. H. Hardin, Feb 21 2018

Status

approved