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 | 1 |
| 4 | 10 |
| 5 | 21 |
| 6 | 97 |
| 7 | 657 |
| 8 | 5618 |
| 9 | 48918 |
| 10 | 494530 |
| 11 | 5383553 |
| 12 | 65112565 |
| 13 | 840566081 |
| 14 | 11834555867 |
| 15 | 176621056393 |
| 16 | 2838064404989 |
| 17 | 48060623405313 |