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 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 5 |
| 5 | 10 |
| 6 | 1034 |
| 7 | 1619 |
| 8 | 19940 |
| 9 | 151012 |
| 10 | 185354 |
| 11 | 937444 |
| 12 | 17714660 |
| 13 | 30594058 |
| 14 | 53467077 |
| 15 | 401540691 |
| 16 | 1127208901 |
| 17 | 34761279059 |
| 18 | 1529978475530 |
| 19 | 12645510928325 |