A297816 - OEIS

A297816

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

0, 4, 48, 466, 4444, 46701, 467104, 4833331, 52153064, 578390147, 6590059758, 79294094586, 1014580074422, 13933640462306, 204079081718026

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

OFFSET

1,2

COMMENTS

Diagonal of A297823.

LINKS

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2018

STATUS

approved