A297987 - OEIS

A297987

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

0, 4, 48, 466, 5100, 74675, 1276012, 30240388, 1056360518, 50037661325, 3406737828874, 353272517327686, 52791942245108114

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

OFFSET

1,2

COMMENTS

Diagonal of A297993.

LINKS

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 10 2018

STATUS

approved