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A233014
Number of nX4 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 in row major order
1
14, 515, 19643, 750092, 28644884, 1093911305, 41775098873, 1595338735322, 60923990363594, 2326610975034335, 88850362536855143, 3393084193289939192, 129577640587140970544, 4948407992160122812805, 188973510753274141448453
OFFSET
1,1
COMMENTS
Column 4 of A233018
LINKS
FORMULA
Empirical: a(n) = 46*a(n-1) -312*a(n-2) +530*a(n-3) -263*a(n-4)
EXAMPLE
Some solutions for n=3
..0..1..1..3....0..1..1..3....0..0..1..0....0..1..0..1....0..0..1..0
..1..1..1..3....0..0..0..1....1..1..0..2....1..3..2..3....0..1..0..0
..3..3..1..1....2..2..2..3....3..1..1..0....3..1..0..1....0..0..2..2
CROSSREFS
Sequence in context: A378921 A320288 A344114 * A209096 A159645 A297805
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 03 2013
STATUS
approved