This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A214905 #6 Jul 22 2025 23:19:51 %S A214905 8,20,136,2490,100350,8156190,1207302502,309961452102,129904063711602, %T A214905 85673347663408802,85480932170854384802,125968968872611859748002, %U A214905 266580924247101550726536002,795103957638983793244454088002 %N A214905 Number of nXnXn triangular 0..7 arrays with every horizontal row nondecreasing and having the same average value. %C A214905 Column 7 of A214906 %H A214905 R. H. Hardin, <a href="/A214905/b214905.txt">Table of n, a(n) for n = 1..79</a> %e A214905 Some solutions for n=4 %e A214905 .....3........5........3........3........2........5........3........4 %e A214905 ....3.3......5.5......1.5......1.5......0.4......3.7......2.4......3.5 %e A214905 ...0.4.5....1.7.7....0.3.6....0.3.6....0.3.3....5.5.5....1.4.4....1.4.7 %e A214905 ..0.4.4.4..4.4.6.6..1.1.5.5..1.1.4.6..0.0.3.5..2.6.6.6..1.3.4.4..3.3.5.5 %K A214905 nonn %O A214905 1,1 %A A214905 _R. H. Hardin_ Jul 29 2012