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A206376
Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having the same number of equal diagonal or antidiagonal elements, and new values 0..3 introduced in row major order
0
15, 1369, 1198601, 6554439373, 200108001096137, 33391295169652273181
OFFSET
1,1
COMMENTS
Diagonal of A206383
EXAMPLE
Some solutions for n=4
..0..0..0..1..0....0..0..0..0..1....0..1..0..1..0....0..0..0..0..0
..0..2..0..0..2....1..2..2..2..3....0..0..2..0..0....1..0..1..0..2
..3..0..0..1..0....1..3..1..0..3....3..0..0..1..0....3..1..1..1..0
..3..3..0..0..2....0..2..1..0..2....1..3..0..0..0....1..0..1..0..0
..1..3..3..0..0....3..3..3..3..1....0..1..3..0..2....3..1..1..1..0
CROSSREFS
Sequence in context: A183550 A071972 A350994 * A331465 A223058 A200994
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 07 2012
STATUS
approved