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 A357648 #6 Oct 10 2022 04:34:04 %S A357648 1,0,0,1,1,0,0,0,2,0,0,1,2,0,0,1,3,0,0,1,5,0,0,2,8,0,0,2,13,0,0,3,20, %T A357648 0,0,5,33,0,0,6,55,0,0,10,93,0,0,13,157,0,0,22,268,0,0,30,461,0,0,51, %U A357648 801,0,0,71,1396,0,0,124,2459,0,0,175,4329,0,0,317,7696 %N A357648 Number of polyominoes with n cells that have the symmetry group D_8 and are without holes. %Y A357648 Cf. A000104, A142886. %K A357648 nonn %O A357648 1,9 %A A357648 _John Mason_, Oct 10 2022