# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a212026 Showing 1-1 of 1 %I A212026 #5 Dec 18 2015 18:18:10 %S A212026 0,0,2,0,2,9,0,0,25,31,0,0,34,346,80,0,0,35,1793,2589,171,0,0,35,4785, %T A212026 44294,12636,322,0,0,0,7396,440660,532619,46612,554,0,0,0,8220, %U A212026 2655126,14245030,4022727,141520,891,0,0,0,8291,9881099,254601542,231475447 %N A212026 T(n,k)=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-k-1 %C A212026 Table starts %C A212026 ...0......0........0..........0............0............0...........0 %C A212026 ...2......2........0..........0............0............0...........0 %C A212026 ...9.....25.......34.........35...........35............0...........0 %C A212026 ..31....346.....1793.......4785.........7396.........8220........8291 %C A212026 ..80...2589....44294.....440660......2655126......9881099....23187213 %C A212026 .171..12636...532619...14245030....254601542...3122930515.26618503099 %C A212026 .322..46612..4022727..231475447...9411294829.279615006837 %C A212026 .554.141520.22156544.2383699176.187291345391 %H A212026 R. H. Hardin, Table of n, a(n) for n = 1..84 %e A212026 Some solutions for n=4 k=4 %e A212026 ..0........0........0........0........0........0........0........0 %e A212026 ..1.2......1.2......1.2......1.2......1.2......1.2......1.2......1.2 %e A212026 ..3.4.3....0.3.4....3.2.3....3.4.1....3.0.3....3.4.5....0.3.4....1.3.1 %e A212026 ..5.6.1.7..4.5.4.5..3.4.3.5..5.0.6.0..2.4.3.5..0.2.3.1..5.6.4.1..1.4.1.5 %Y A212026 Column 1 is A211924 %K A212026 nonn,tabl %O A212026 1,3 %A A212026 _R. H. Hardin_ Apr 26 2012 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE