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 A362223 #7 Apr 12 2023 10:51:52 %S A362223 1,4,20,113,682,4294,27830,184240,1239575,8446660,58150684,403735761 %N A362223 a(n) is the number of n-celled fixed rounded polyominoes. %C A362223 See A056840 for the definition of rounded polyominoes. %Y A362223 Cf. A056840, A362224. %K A362223 nonn,more %O A362223 1,2 %A A362223 _John Mason_, Apr 11 2023