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 A104433 #9 Nov 18 2020 19:47:01 %S A104433 1,1,2,4,10,20,56,117,323,745,1896,4242,12883,29108,75725,183366, %T A104433 504215,1176776 %N A104433 Number of ways to split 1, 2, 3, ..., 7n into n arithmetic progressions each with 7 terms. %Y A104433 Cf. A104429-A104432, A104434-A104443. %K A104433 nonn,more %O A104433 0,3 %A A104433 _Jonas Wallgren_, Mar 17 2005 %E A104433 a(0), a(11)-a(17) from _Alois P. Heinz_, Nov 18 2020