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A212023
Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal, diagonal or antidiagonal neighbor, and containing the value n(n+1)/2-4
0
0, 0, 34, 1793, 44294, 532619, 4022727, 22156544, 97173498, 358710379, 1156729484, 3344765527, 8839882229
OFFSET
1,3
COMMENTS
Column 3 of A212026
EXAMPLE
Some solutions for n=4
..0........0........0........0........0........0........0........0
..1.2......1.2......1.2......1.2......1.2......1.2......1.2......1.2
..3.4.0....3.4.3....3.4.3....3.4.3....3.4.0....1.3.4....3.0.4....1.3.4
..1.5.6.1..5.4.6.4..5.2.0.6..5.6.3.6..1.5.2.6..5.2.1.6..4.1.5.6..5.0.6.0
CROSSREFS
Sequence in context: A202297 A296673 A086881 * A056566 A335090 A242177
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 26 2012
STATUS
approved