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 | 63 |
| 2 | 3367 |
| 3 | 167337 |
| 4 | 8057905 |
| 5 | 384479935 |
| 6 | 18287614751 |
| 7 | 868972410929 |
| 8 | 41278350729313 |
| 9 | 1960665141991079 |
| 10 | 93127506982471999 |
| 11 | 4423369428678533705 |
| 12 | 210101996822111263265 |
| 13 | 9979493366382754619551 |
| 14 | 474010149850018604630031 |
| 15 | 22514756623847166766088601 |