A243245 Duplicate of A128240.
0, 0, 1, 3, 15, 93, 794, 10850, 259700, 11706739
Offset: 1
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.