A222913 - OEIS

A222913

Number of nX2 0..2 arrays with exactly floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order.

0, 6, 18, 136, 654, 3972, 21778, 127226, 727214, 4237154, 24617576, 144049162, 843945398, 4961892900, 29226194746, 172530718840, 1020187713214, 6042341555988, 35837121558046, 212824919490178, 1265353059527832

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

OFFSET

1,2

COMMENTS

Column 2 of A222918

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=3

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

..0..1....2..2....0..2....0..0....2..2....2..1....2..0....1..0....1..1....0..0

..2..0....1..2....0..1....2..1....2..1....0..1....2..2....1..2....0..2....1..2