A223005 - OEIS

A223005

Number of n X n 0..1 arrays with no more than floor(n X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order

1, 4, 24, 840, 35471, 8156595, 2073830655, 2804191942757, 4149994855051281, 32191007835248846536, 272625366029849993313502, 11994700692484110855119938470

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OFFSET

1,2

COMMENTS

Diagonal of A223012

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=3

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

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

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