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 | 7 |
| 3 | 43 |
| 4 | 403 |
| 5 | 5245 |
| 6 | 89132 |
| 7 | 1898630 |
| 8 | 49209846 |
| 9 | 1517275859 |
| 10 | 54669946851 |
| 11 | 2269075206395 |
| 12 | 107199678164289 |
| 13 | 5707320919486026 |
| 14 | 339510756324234931 |
| 15 | 22400182888853554291 |
| 16 | 1628654713107465602783 |
| 17 | 129754625253841669625051 |