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 A350580 #6 Jan 18 2022 06:08:30 %S A350580 0,0,0,0,0,0,2,11,76,422,2187,10625,49381,221738,969583,4153567 %N A350580 Number of n-celled polytans with holes. %Y A350580 Cf. A006074, A001419. %K A350580 nonn,more,hard %O A350580 1,7 %A A350580 _John Mason_, Jan 07 2022