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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 23 |
| 5 | 104 |
| 6 | 532 |
| 7 | 3005 |
| 8 | 18453 |
| 9 | 121853 |
| 10 | 858239 |
| 11 | 6406401 |
| 12 | 50422167 |
| 13 | 416666542 |
| 14 | 3602203962 |
| 15 | 32481902733 |