|
%I
%S 0,0,35,4785,440660,14245030,231475447,2383699176,17770342627
%N 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)/2-5
%C Column 4 of A212026
%e Some solutions for n=4
%e ..0........0........0........0........0........0........0........0
%e ..1.2......1.2......1.2......0.1......1.2......1.2......1.2......1.2
%e ..0.3.4....3.4.3....3.4.1....0.2.3....3.2.0....3.4.0....3.4.5....0.3.4
%e ..1.5.0.1..5.6.3.6..3.0.1.5..4.5.3.5..3.4.3.5..2.5.2.1..2.6.7.2..5.6.7.0
%K nonn
%O 1,3
%A _R. H. Hardin_ Apr 26 2012
| 