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A200796
Number of nX3 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors
2
5, 178, 9880, 583813, 34679839, 2060918000, 122478253815, 7278777317468, 432571571252989, 25707362563355693, 1527766813187552208, 90793889493222901029, 5395804057415427972197, 320668071260622898796015
OFFSET
1,1
COMMENTS
Column 3 of A200801
LINKS
FORMULA
Empirical: a(n) = 60*a(n-1) -17*a(n-2) -964*a(n-3) -2509*a(n-4) +968*a(n-5) +23125*a(n-6) +31652*a(n-7) -4566*a(n-8) -17118*a(n-9) -29646*a(n-10) -74826*a(n-11) -64125*a(n-12) -13932*a(n-13) +4131*a(n-14) +1458*a(n-15) for n>16
EXAMPLE
Some solutions for n=4
..0..0..0....0..0..1....0..0..0....0..0..1....0..0..1....0..0..0....0..0..1
..1..2..2....0..2..2....1..2..2....2..0..1....1..2..0....1..2..0....1..2..0
..0..0..3....1..2..3....1..2..2....2..3..3....3..0..0....3..1..1....1..3..3
..2..3..2....0..0..0....2..0..1....3..3..2....3..0..1....0..3..2....3..2..0
CROSSREFS
Sequence in context: A111515 A157204 A248383 * A241115 A208196 A194571
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 22 2011
STATUS
approved