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A281656

Number of 4 X n 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

0, 384, 10572, 135444, 1887730, 23075928, 270969324, 3113195344, 34971286598, 386653964892, 4223141414822, 45663070459288, 489646946151752, 5214047221217132, 55193564929148884, 581272228367033168

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

OFFSET

1,2

COMMENTS

Row 4 of A281653.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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