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 A057426 #10 Jun 04 2022 19:39:51 %S A057426 0,0,0,0,0,0,0,5,31,185,947,4564,21004,93833,410295,1765378,7504024, %T A057426 31591157,131982937,547971412,2263443059,9309302775,38149945673, %U A057426 155858903955,635066943350,2581736396181 %N A057426 Number of asymmetric n-celled polyominoes with 1 hole. %H A057426 Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/animals.html">Enumeration of polyominoes</a> %Y A057426 Cf. A056884. %K A057426 nonn %O A057426 1,8 %A A057426 _N. J. A. Sloane_, Sep 05 2000