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.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 5 |
| 4 | 49 |
| 5 | 356 |
| 6 | 2678 |
| 7 | 21085 |
| 8 | 166814 |
| 9 | 1345812 |
| 10 | 11080939 |
| 11 | 92699035 |
| 12 | 786630700 |
| 13 | 6757485506 |