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 A214903 #6 Jul 22 2025 23:19:37 %S A214903 6,12,50,458,7550,210914,8943218,560965610,49301091506,5963375071586, %T A214903 960019298157026,203519951213429090,55357173186669891938, %U A214903 19153563370287789473858,8293491297187189536699650 %N A214903 Number of nXnXn triangular 0..5 arrays with every horizontal row nondecreasing and having the same average value. %C A214903 Column 5 of A214906 %H A214903 R. H. Hardin, <a href="/A214903/b214903.txt">Table of n, a(n) for n = 1..107</a> %e A214903 Some solutions for n=4 %e A214903 .....4........2........3........4........4........3........3........4 %e A214903 ....4.4......0.4......2.4......3.5......3.5......3.3......1.5......3.5 %e A214903 ...3.4.5....1.2.3....2.2.5....3.4.5....3.4.5....3.3.3....2.3.4....4.4.4 %e A214903 ..4.4.4.4..0.0.3.5..2.3.3.4..3.4.4.5..3.3.5.5..1.3.4.4..3.3.3.3..3.3.5.5 %K A214903 nonn %O A214903 1,1 %A A214903 _R. H. Hardin_ Jul 29 2012