login
A283489
Number of nX3 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly one element.
1
0, 2, 59, 576, 5444, 47712, 402588, 3304736, 26585976, 210604104, 1648084920, 12770161232, 98143291572, 749097112304, 5684201101568, 42914522732568, 322570735588252, 2415252852914064, 18022243345734636, 134067764826183784
OFFSET
1,2
COMMENTS
Column 3 of A283494.
LINKS
FORMULA
Empirical: a(n) = 10*a(n-1) +a(n-2) -110*a(n-3) -267*a(n-4) -266*a(n-5) -146*a(n-6) -72*a(n-7) -41*a(n-8) -4*a(n-9) -4*a(n-10) for n>13
EXAMPLE
Some solutions for n=4
..1..0..1. .0..0..0. .0..1..1. .0..1..0. .1..0..1. .1..1..1. .1..1..1
..1..0..1. .1..0..1. .0..1..1. .1..0..1. .1..1..1. .0..1..0. .0..1..1
..1..1..1. .1..1..1. .1..1..0. .1..1..1. .1..0..0. .1..1..0. .0..1..0
..1..1..0. .1..0..0. .0..0..0. .0..1..0. .1..0..1. .0..0..0. .1..0..1
CROSSREFS
Cf. A283494.
Sequence in context: A138982 A142666 A349501 * A051055 A003827 A241324
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 08 2017
STATUS
approved