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A212024 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 0

%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

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Last modified May 25 18:25 EDT 2022. Contains 354071 sequences. (Running on oeis4.)