A280905 - OEIS

A280905

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

0, 124, 22632, 1451655, 65348136, 2571528867, 91647699996, 3072729111454, 98499096530389, 3053023277146528, 92172928166402753, 2724604438231223343, 79153860087200853877, 2266446081673358266508, 64102854500808145878543

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

OFFSET

1,2

COMMENTS

Row 4 of A280902.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..87

EXAMPLE

Some solutions for n=3

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

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

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