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 | 2 |
| 3 | 6 |
| 4 | 23 |
| 5 | 104 |
| 6 | 532 |
| 7 | 3002 |
| 8 | 18375 |
| 9 | 120559 |
| 10 | 840480 |
| 11 | 6184729 |
| 12 | 47788384 |
| 13 | 386126534 |
| 14 | 3251434927 |
| 15 | 28454039404 |