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 | 0 |
| 1 | 1 |
| 2 | 14 |
| 3 | 321 |
| 4 | 13684 |
| 5 | 986345 |
| 6 | 108504786 |
| 7 | 16926795529 |
| 8 | 3554627458376 |
| 9 | 966858672295089 |
| 10 | 330665665961417590 |
| 11 | 138879579704199815921 |
| 12 | 70273067330329989586044 |
| 13 | 42163840398198057552632281 |
| 14 | 29599015959535037299068127994 |
| 15 | 24034400959142450300350904324985 |