A222879 - OEIS

A222879

Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order

2, 11, 122, 1814, 26311, 399849, 6013669, 91842381, 1400573929, 21492587457, 330100781811, 5085688832352, 78450837933529, 1212393597214424, 18758126651572197, 290589347000277975, 4505965014075887115

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

OFFSET

1,1

COMMENTS

Row 2 of A222878

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..60

EXAMPLE

Some solutions for n=3

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

..0..2..3....2..1..3....1..0..2....0..1..0....3..0..1....2..3..2....2..2..3

CROSSREFS