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 A055564 #5 Jul 29 2022 22:28:47 %S A055564 1,2,6,43,7794,387355897233,58111569344245781528237519282283636 %N A055564 Bisection of A055878. %Y A055564 Cf. A055878. %K A055564 nonn %O A055564 1,2 %A A055564 _John W. Layman_, Jul 15 2000 %E A055564 Next term is too large to include.