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 | 6 |
| 3 | 57 |
| 4 | 760 |
| 5 | 13265 |
| 6 | 289116 |
| 7 | 7600873 |
| 8 | 234730224 |
| 9 | 8340307137 |
| 10 | 335388171700 |
| 11 | 15062758093361 |
| 12 | 747393408423432 |
| 13 | 40606032733746961 |
| 14 | 2397539426985311532 |
| 15 | 152864047998089113785 |
| 16 | 10467226142002168282336 |
| 17 | 766094017043351707135745 |