A136039 Bisection of A138551.
1, 2, 23, 684, 34760, 2493096, 228253267, 25091028820, 3179942075960, 451649016238160, 70421753109861592, 11869050034269797984, 2136758627313217104448
Offset: 0
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.