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A208781
Number of n X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any antidiagonal neighbor (colorings ignoring permutations of colors)
0
1, 10, 9089, 3038188519, 955922762706415420, 584640904301741699504623887947
OFFSET
1,2
COMMENTS
Diagonal of A208788
EXAMPLE
Some solutions for n=4
..0..1..0..0....0..0..1..2....0..0..0..0....0..0..0..0....0..0..1..2
..0..1..1..1....1..0..0..0....1..2..1..0....1..1..1..0....1..0..0..0
..0..2..0..0....1..1..1..0....3..0..1..0....0..2..1..0....1..1..1..0
..0..1..1..0....0..2..1..0....1..0..1..0....0..0..1..0....2..0..1..0
CROSSREFS
Sequence in context: A291562 A203589 A109893 * A125544 A137641 A137642
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 01 2012
STATUS
approved