A284337 - OEIS

A284337

Number of 4 X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

8, 42, 415, 5130, 68458, 966889, 13941789, 204883324, 3047634270, 45762072338, 692220227870, 10532157295267, 161005503857341, 2470999756894057, 38049394554096755, 587563040419449964, 9095438545580032870

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

OFFSET

1,1

COMMENTS

Row 4 of A284334.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..128

EXAMPLE

Some solutions for n=4

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

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

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