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 | 533 |
| 7 | 3027 |
| 8 | 18769 |
| 9 | 125687 |
| 10 | 901366 |
| 11 | 6876307 |
| 12 | 55498146 |
| 13 | 471743013 |
| 14 | 4207097145 |
| 15 | 39237139709 |