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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 34 |
| 6 | 202 |
| 7 | 1402 |
| 8 | 11122 |
| 9 | 99322 |
| 10 | 986362 |
| 11 | 10784122 |
| 12 | 128720122 |
| 13 | 1665516922 |
| 14 | 23220588922 |
| 15 | 347025670522 |
| 16 | 5534133996922 |
| 17 | 93802153836922 |
| 18 | 1683934185324922 |
| 19 | 31917365573484922 |
| 20 | 636941680764780922 |
| 21 | 13348854673487724922 |