A298884 - OEIS

A298884

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

0, 3, 15, 40, 123, 516, 1818, 7768, 41048, 242083, 1483959, 10171555

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

OFFSET

1,2

COMMENTS

Diagonal of A298888.

LINKS

EXAMPLE

Some solutions for n=7

..0..1..0..1..0..0..0. .0..1..1..0..0..1..1. .0..0..1..0..0..1..1

..1..0..0..1..1..1..1. .1..0..0..0..0..0..0. .1..0..1..1..1..0..0

..0..0..0..1..1..1..0. .1..0..0..0..1..0..1. .0..1..0..1..0..1..0

..0..0..1..1..1..1..0. .0..0..0..0..1..1..0. .0..1..1..1..1..1..1

..0..1..0..1..1..1..1. .0..0..1..1..0..1..0. .1..0..1..1..1..0..0

..0..0..1..1..0..0..0. .1..0..0..1..1..0..1. .1..0..1..1..1..0..1

..1..1..0..0..1..1..1. .1..0..1..0..0..1..0. .1..0..1..0..0..1..0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 28 2018

STATUS

approved