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 | 126 |
| 2 | 2898 |
| 3 | 25886 |
| 4 | 133506 |
| 5 | 490014 |
| 6 | 1433810 |
| 7 | 3573054 |
| 8 | 7902594 |
| 9 | 15942206 |
| 10 | 29896146 |
| 11 | 52834014 |
| 12 | 88892930 |
| 13 | 143501022 |
| 14 | 223622226 |
| 15 | 338022398 |
| 16 | 497556738 |
| 17 | 715478526 |
| 18 | 1007769170 |
| 19 | 1393489566 |