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 | 20 |
| 2 | 449 |
| 3 | 6792 |
| 4 | 67063 |
| 5 | 484419 |
| 6 | 2750715 |
| 7 | 12919671 |
| 8 | 52083292 |
| 9 | 185179593 |
| 10 | 592791088 |
| 11 | 1736022657 |
| 12 | 4710111660 |
| 13 | 11959634412 |
| 14 | 28654640036 |
| 15 | 65224656452 |
| 16 | 141850935657 |
| 17 | 296163412400 |
| 18 | 596041392921 |
| 19 | 1160330645548 |
| 20 | 2191579277799 |
| 21 | 4026627536451 |
| 22 | 7213267409435 |