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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
OFFSET
1,1
COMMENTS
Column 4 of A281326.
LINKS
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 * A360702 A249359 A249255
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 20 2017
STATUS
approved