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A203788
Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements
0
112, 10576, 3784288, 5426653360, 31960919852416, 783865714144759744, 80711089384087351043680
OFFSET
1,1
COMMENTS
Diagonal of A203796
EXAMPLE
Some solutions for n=4
..3..2..2..1..1....1..1..3..3..0....1..0..2..0..1....1..0..0..0..0
..3..3..2..2..1....3..1..1..3..3....2..1..0..0..0....3..1..0..1..0
..3..3..3..2..2....1..1..1..1..3....1..3..1..0..0....1..3..1..3..1
..2..3..1..3..2....2..1..3..1..1....2..1..1..1..0....1..1..3..0..3
..0..2..3..1..3....2..2..1..2..1....1..1..2..1..1....0..1..1..3..0
CROSSREFS
Sequence in context: A223613 A075910 A089277 * A180027 A240229 A187672
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 05 2012
STATUS
approved