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A281322 Number of nX4 0..2 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards. 1
2, 394, 21734, 953236, 37854870, 1420883314, 51413566384, 1813061036754, 62727044483806, 2138467742923228, 72055764763969422, 2404909539462228154, 79633692821692812712, 2619397411313883712026, 85670871878295276005590 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A281326.

LINKS

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

FORMULA

Empirical: a(n) = 58*a(n-1) -753*a(n-2) -2606*a(n-3) -532*a(n-4) +7074*a(n-5) +6399*a(n-6) -4374*a(n-7) -6561*a(n-8) for n>9

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Cf. A281326.

Sequence in context: A176937 A092701 A321230 * A249359 A249255 A249171

Adjacent sequences:  A281319 A281320 A281321 * A281323 A281324 A281325

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 20 2017

STATUS

approved

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Last modified May 23 18:08 EDT 2022. Contains 353993 sequences. (Running on oeis4.)