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 A189811 #7 Jul 22 2025 11:55:02 %S A189811 94,330,732,1308,2060,2960,4032,5250,6604,8082,9684,11388,13220,15144, %T A189811 17156,19268,21484,23784,26176,28656,31236,33900,36648,39480,42404, %U A189811 45420,48520,51704,54972,58324,61768,65296,68908,72604,76384,80248,84200,88236 %N A189811 Number of right triangles on a (n+1)X7 grid. %C A189811 Column 6 of A189814 %H A189811 R. H. Hardin, <a href="/A189811/b189811.txt">Table of n, a(n) for n = 1..200</a> %F A189811 Empirical: a(n) = 42*n^2 + 886*n - 6080 for n>35 %e A189811 Some solutions for n=3 %e A189811 ..3..3....1..4....3..3....1..2....2..3....3..3....0..3....2..4....2..5....1..3 %e A189811 ..0..3....0..5....1..3....0..2....0..3....2..3....0..4....1..4....1..5....0..1 %e A189811 ..3..4....2..5....3..5....1..4....2..5....3..2....3..3....2..2....2..2....3..2 %K A189811 nonn %O A189811 1,1 %A A189811 _R. H. Hardin_ Apr 28 2011