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 A189812 #7 Jul 22 2025 11:55:09 %S A189812 124,434,972,1754,2784,4032,5520,7224,9128,11218,13500,15938,18568, %T A189812 21328,24216,27248,30432,33728,37152,40696,44376,48176,52096,56128, %U A189812 60288,64572,68968,73476,78104,82844,87712,92692,97784,102988,108304,113740,119296 %N A189812 Number of right triangles on a (n+1)X8 grid. %C A189812 Column 7 of A189814 %H A189812 R. H. Hardin, <a href="/A189812/b189812.txt">Table of n, a(n) for n = 1..200</a> %F A189812 Empirical: a(n) = 56*n^2 + 1480*n - 12216 for n>48 %e A189812 Some solutions for n=3 %e A189812 ..3..5....0..2....2..2....0..3....3..3....0..3....1..7....3..0....2..7....2..5 %e A189812 ..1..6....0..7....0..2....2..1....2..3....0..5....0..5....1..0....1..7....2..1 %e A189812 ..2..3....1..2....2..7....2..5....3..2....2..3....3..6....3..7....2..6....3..5 %K A189812 nonn %O A189812 1,1 %A A189812 _R. H. Hardin_ Apr 28 2011