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 A195803 #6 Jul 22 2025 12:46:58 %S A195803 1,1,7,343,12469,5828215 %N A195803 Number of triangular nXnXn 0..6 arrays with all rows and diagonals having the same length having the same sum, with corners zero. %C A195803 Column 6 of A195805 %e A195803 Some solutions for n=5 %e A195803 ......0..........0..........0..........0..........0..........0..........0 %e A195803 .....3.6........4.1........2.5........1.6........0.5........0.6........1.2 %e A195803 ....1.4.0......3.5.1......5.0.3......1.4.0......1.1.1......2.2.2......0.2.0 %e A195803 ...6.2.3.4....0.4.6.5....3.2.4.2....6.2.3.2....5.1.1.0....6.2.2.0....2.2.2.1 %e A195803 ..0.3.2.5.0..0.5.2.0.0..0.4.1.5.0..0.1.2.5.0..0.0.1.5.0..0.0.2.6.0..0.1.0.2.0 %K A195803 nonn %O A195803 1,3 %A A195803 _R. H. Hardin_ Sep 23 2011