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) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 14 |
| 4 | 49 |
| 5 | 376 |
| 6 | 1987 |
| 7 | 21328 |
| 8 | 150337 |
| 9 | 2074624 |
| 10 | 18279971 |
| 11 | 308317184 |
| 12 | 3259985969 |
| 13 | 64981320704 |
| 14 | 801591982115 |
| 15 | 18436312819712 |
| 16 | 259914703640065 |
| 17 | 6774998673915904 |
| 18 | 107452993132016323 |
| 19 | 3130412454801965056 |