login
A199650
Number of nX3 0..2 arrays with values 0..2 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors
1
5, 113, 2584, 59212, 1357484, 31120632, 713445976, 16355879648, 374961537040, 8596061907680, 197066293538400, 4517780870646656, 103570953858672192, 2374383085485820032, 54433167085958461312, 1247890324488906825728
OFFSET
1,1
COMMENTS
Column 3 of A199655
LINKS
FORMULA
Empirical: a(n) = 21*a(n-1) +44*a(n-2) +8*a(n-3) -96*a(n-4) -364*a(n-5) -264*a(n-6) +256*a(n-7) +288*a(n-8) +64*a(n-9) for n>10
EXAMPLE
Some solutions for n=4
..0..0..1....0..0..1....0..1..1....0..1..0....0..0..1....0..0..1....0..1..2
..1..0..1....1..0..2....0..2..2....1..0..1....1..1..1....2..2..0....1..0..1
..0..2..2....1..2..0....1..0..0....0..0..2....1..0..2....2..1..0....1..1..0
..1..2..2....0..0..2....2..2..2....2..2..0....1..0..0....2..0..0....0..0..2
CROSSREFS
Sequence in context: A224897 A086805 A163014 * A241109 A208317 A279836
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 08 2011
STATUS
approved