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 | 21 |
| 2 | 2356 |
| 3 | 196785 |
| 4 | 17525619 |
| 5 | 1539222016 |
| 6 | 135658637925 |
| 7 | 11945257052321 |
| 8 | 1052091957273408 |
| 9 | 92657526436631289 |
| 10 | 8160498611028648795 |
| 11 | 718704019165239462736 |
| 12 | 63297158846544276862187 |
| 13 | 5574656798624151746571203 |
| 14 | 490966794038702258639391536 |
| 15 | 43240039834820302340627322251 |