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 A190096 #7 Jul 22 2025 12:01:46 %S A190096 7,32,82,164,273,412,564,736,918,1112,1306,1520,1734,1960,2198,2448, %T A190096 2698,2964,3230,3508,3790,4084,4378,4684,4996,5320,5644,5980,6316, %U A190096 6664,7012,7372,7732,8104,8480,8868,9256,9656,10056,10468,10880,11304,11728,12164 %N A190096 Number of rhombuses on a (n+1)X8 grid. %C A190096 Column 7 of A190098 %H A190096 R. H. Hardin, <a href="/A190096/b190096.txt">Table of n, a(n) for n = 1..200</a> %F A190096 Empirical: a(n) = 2*a(n-1) -2*a(n-3) +a(n-4) for n>51 %e A190096 Some solutions for n=3 %e A190096 ..1..3....0..2....0..5....0..3....1..3....0..3....0..5....0..1....0..4....2..4 %e A190096 ..1..5....1..1....1..3....1..5....2..0....0..6....1..4....1..3....0..7....2..5 %e A190096 ..3..5....2..2....3..2....3..4....3..3....3..6....2..5....3..2....3..7....3..5 %e A190096 ..3..3....1..3....2..4....2..2....2..6....3..3....1..6....2..0....3..4....3..4 %K A190096 nonn %O A190096 1,1 %A A190096 _R. H. Hardin_ May 04 2011