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A230246
Number of nX3 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero
1
0, 6, 34, 514, 5838, 64838, 722386, 8040426, 89496950, 996201406, 11088801786, 123430533890, 1373917986238, 15293224744246, 170230491719618, 1894853512698394, 21091813842617094, 234775199414692462
OFFSET
1,2
COMMENTS
Column 3 of A230250
LINKS
FORMULA
Empirical: a(n) = 19*a(n-1) -112*a(n-2) +308*a(n-3) -443*a(n-4) +531*a(n-5) -1290*a(n-6) +2646*a(n-7) -1150*a(n-8) -3528*a(n-9) +4044*a(n-10) -384*a(n-11) +752*a(n-12) -384*a(n-13)
EXAMPLE
Some solutions for n=3
..0..3..0....0..3..2....0..1..0....0..1..2....0..1..2....0..3..0....0..1..0
..1..2..1....1..2..3....3..2..1....3..2..3....3..2..3....1..2..1....3..2..1
..0..1..0....0..1..0....2..3..0....0..1..0....2..1..0....0..3..2....2..1..0
CROSSREFS
Sequence in context: A284330 A125759 A062819 * A092336 A262104 A161323
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 13 2013
STATUS
approved