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 | 14 |
| 2 | 106 |
| 3 | 674 |
| 4 | 4946 |
| 5 | 37014 |
| 6 | 283330 |
| 7 | 2196782 |
| 8 | 17189858 |
| 9 | 135356102 |
| 10 | 1070440026 |
| 11 | 8490518798 |
| 12 | 67481635442 |
| 13 | 537075903014 |
| 14 | 4278507764938 |
| 15 | 34105515215934 |
| 16 | 271984108754114 |
| 17 | 2169645089403350 |
| 18 | 17310883131943930 |
| 19 | 138136179160503278 |