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 A068728 #9 Mar 07 2024 19:51:39 %S A068728 1,7,925,3096791,251611610655,500885416261650533, %T A068728 24461989414349531084868443,29358790904767905695470325002387331 %N A068728 Number of solenoidal flows (flow in = flow out) in an n X n square array with integer velocities in -3 .. 3. %Y A068728 By size 3 X 3, ..., 6 X 6 A068722-A068725, by velocity limit 1..13 A068726-A068738. %K A068728 nonn,more %O A068728 1,2 %A A068728 _R. H. Hardin_, Feb 26 2002 %E A068728 a(7)-a(8) from _Sean A. Irvine_, Mar 07 2024