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 A214911 #6 Jul 22 2025 23:20:28 %S A214911 2,578,13442,657722,8943218,130431428,1207302502,10272615125, %T A214911 64849263302,384014075750,1885027008818,8723067515222,34924262211422, %U A214911 133490468673758,458639082931598,1515242313469477,4594326578653430,13491494779735190 %N A214911 Number of 7X7X7 triangular 0..n arrays with every horizontal row nondecreasing and having the same average value. %C A214911 Row 7 of A214906 %H A214911 R. H. Hardin, <a href="/A214911/b214911.txt">Table of n, a(n) for n = 1..210</a> %e A214911 Some solutions for n=4 %e A214911 ........2..............2..............2..............2..............2 %e A214911 .......0.4............0.4............0.4............0.4............0.4 %e A214911 ......1.1.4..........1.1.4..........0.2.4..........1.1.4..........1.1.4 %e A214911 .....2.2.2.2........0.2.3.3........2.2.2.2........0.2.3.3........1.2.2.3 %e A214911 ....0.2.2.3.3......0.2.2.3.3......1.1.2.3.3......0.0.3.3.4......0.1.3.3.3 %e A214911 ...2.2.2.2.2.2....0.0.2.3.3.4....0.2.2.2.2.4....0.2.2.2.3.3....0.1.1.3.3.4 %e A214911 ..0.1.2.2.3.3.3..1.1.1.1.2.4.4..0.1.1.2.2.4.4..0.0.2.2.3.3.4..0.1.1.1.3.4.4 %K A214911 nonn %O A214911 1,1 %A A214911 _R. H. Hardin_ Jul 29 2012