A299887 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Diagonal of A299893.

LINKS

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

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 21 2018

STATUS

approved