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A203793
Number of (n+1)X6 0..3 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements
1
268912, 25708528, 2700695728, 292394880208, 31960919852416, 3504288958063120, 384592800378103840, 42221697503213865232, 4635668075250677308048, 508981841189128273397536, 55885153963195016152757056
OFFSET
1,1
COMMENTS
Column 5 of A203796
LINKS
FORMULA
Empirical: a(n) = 148*a(n-1) -3999*a(n-2) -35082*a(n-3) +1582335*a(n-4) -9332901*a(n-5) -26191026*a(n-6) +302396490*a(n-7) -400942710*a(n-8) -868046544*a(n-9) +1153030140*a(n-10) +438143580*a(n-11) -442158912*a(n-12)
EXAMPLE
Some solutions for n=4
..3..1..3..3..0..0....2..0..1..3..2..0....1..3..2..3..1..3....2..1..0..3..3..3
..3..3..3..3..3..0....0..0..0..1..3..2....2..1..3..1..3..2....3..2..1..0..3..1
..1..3..0..3..3..3....3..0..3..0..1..3....0..2..1..3..3..3....3..3..2..1..0..3
..2..1..3..0..3..3....3..3..2..3..0..1....3..0..2..1..3..2....0..3..3..2..1..0
..2..2..1..3..3..2....3..0..3..0..3..0....2..3..0..2..1..3....1..0..3..3..2..1
CROSSREFS
Sequence in context: A075466 A176384 A235821 * A231197 A061736 A124946
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 05 2012
STATUS
approved