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 A214600 #10 Aug 21 2025 10:01:48 %S A214600 2,1127599139,71200442882,43988453613377,1279414854562952, %T A214600 53475958137232241,841074553776240002,12274806721494593819, %U A214600 116639524609385372432,987544941072308915067,6454982934188302466812 %N A214600 Number of 7X7X7 triangular 0..n arrays with every horizontal row having the same average value. %H A214600 R. H. Hardin, <a href="/A214600/b214600.txt">Table of n, a(n) for n = 1..210</a> %e A214600 Some solutions for n=3 %e A214600 ........1..............1..............1..............1..............1 %e A214600 .......0.2............0.2............0.2............0.2............0.2 %e A214600 ......1.1.1..........1.1.1..........1.1.1..........1.1.1..........1.1.1 %e A214600 .....1.1.1.1........1.1.1.1........1.1.1.1........1.1.1.1........1.1.1.1 %e A214600 ....1.1.1.1.1......1.1.1.1.1......1.1.1.1.1......1.1.1.1.1......1.1.1.1.1 %e A214600 ...1.2.0.0.1.2....2.0.1.2.1.0....1.3.1.0.1.0....1.0.2.1.2.0....1.3.1.1.0.0 %e A214600 ..0.3.0.0.3.1.0..2.0.0.0.1.3.1..3.1.0.1.2.0.0..0.3.0.0.0.1.3..0.0.2.2.1.0.2 %Y A214600 Row 7 of A214595. %K A214600 nonn %O A214600 1,1 %A A214600 _R. H. Hardin_, Jul 22 2012