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 | 1 |
| 2 | 9 |
| 3 | 91 |
| 4 | 1063 |
| 5 | 14193 |
| 6 | 213953 |
| 7 | 3602891 |
| 8 | 67168527 |
| 9 | 1375636129 |
| 10 | 30741614905 |
| 11 | 745133551611 |
| 12 | 19485223248311 |
| 13 | 547092691302545 |
| 14 | 16422216867929457 |
| 15 | 524970306508659691 |
| 16 | 17809453107819266335 |
| 17 | 639153386976421052481 |
| 18 | 24196474723945543441769 |
| 19 | 963736849031626750711451 |
| 20 | 40289411871795861783689799 |