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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 10 |
| 5 | 59 |
| 6 | 501 |
| 7 | 3786 |
| 8 | 48337 |
| 9 | 508402 |
| 10 | 6469142 |
| 11 | 81711572 |
| 12 | 2019160542 |
| 13 | 31945830446 |
| 14 | 749115591093 |
| 15 | 15230426073946 |
| 16 | 617313283787616 |
| 17 | 13472047923890487 |