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 | 4 |
| 5 | 10 |
| 6 | 31 |
| 7 | 120 |
| 8 | 594 |
| 9 | 4013 |
| 10 | 35092 |
| 11 | 428080 |
| 12 | 6851545 |
| 13 | 153025576 |
| 14 | 4535778875 |
| 15 | 187380634539 |
| 16 | 10385121165057 |
| 17 | 801710433900516 |