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 | 3 |
| 3 | 14 |
| 4 | 86 |
| 5 | 645 |
| 6 | 5662 |
| 7 | 56632 |
| 8 | 633545 |
| 9 | 7820115 |
| 10 | 105401961 |
| 11 | 1538517351 |
| 12 | 24157841308 |
| 13 | 405778641302 |
| 14 | 7256711524298 |
| 15 | 137607733327779 |
| 16 | 2757147167433326 |
| 17 | 58188668578629283 |
| 18 | 1289965088962987961 |