A212043 Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any element within a city block distance of two, and containing the value n(n+1)/2-6.
0, 0, 5, 463, 339764, 65635205, 3564578765, 89579748909
Offset: 1
Keywords
Examples
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....3.4.5....3.4.1....3.0.1....3.4.5....3.4.1....3.4.5....3.4.5 ..0.5.6.2..5.6.7.8..5.0.3.6..2.4.5.0..2.6.0.4..5.6.3.5..0.6.3.4..6.0.7.3
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