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 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 6 |
| 7 | 17 |
| 8 | 73 |
| 9 | 290 |
| 10 | 1274 |
| 11 | 5844 |
| 12 | 27750 |
| 13 | 135192 |
| 14 | 676263 |
| 15 | 3437509 |
| 16 | 17811771 |
| 17 | 93531354 |
| 18 | 497835030 |
| 19 | 2680058068 |
| 20 | 14577839412 |
| 21 | 80039070868 |
| 22 | 443164758244 |
| 23 | 2472713506356 |