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 A190094 #10 Oct 09 2023 17:40:14 %S A190094 5,20,50,96,151,212,273,344,421,504,587,676,765,860,959,1064,1169, %T A190094 1280,1391,1508,1625,1748,1871,2000,2131,2268,2405,2548,2691,2840, %U A190094 2989,3144,3299,3460,3621,3788,3955,4128,4301,4480,4659,4844,5029,5220,5411,5608 %N A190094 Number of rhombuses on a (n+1) X 6 grid. %H A190094 R. H. Hardin, <a href="/A190094/b190094.txt">Table of n, a(n) for n = 1..200</a> %F A190094 Empirical: a(n) = 2*a(n-1) - 2*a(n-3) + a(n-4) for n>27. %e A190094 Some solutions for n=3: %e A190094 ..1..2....1..0....1..3....1..4....0..4....0..3....0..1....1..3....0..0....2..0 %e A190094 ..1..4....1..2....1..5....1..5....1..3....1..1....0..3....2..1....0..2....2..1 %e A190094 ..3..4....3..2....3..5....2..5....2..4....3..2....2..3....3..3....2..2....3..1 %e A190094 ..3..2....3..0....3..3....2..4....1..5....2..4....2..1....2..5....2..0....3..0 %Y A190094 Column 5 of A190098. %K A190094 nonn %O A190094 1,1 %A A190094 _R. H. Hardin_, May 04 2011