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 | 7 |
| 2 | 65 |
| 3 | 807 |
| 4 | 12993 |
| 5 | 260103 |
| 6 | 6243201 |
| 7 | 174811815 |
| 8 | 5593984641 |
| 9 | 201383466759 |
| 10 | 8055338729409 |
| 11 | 354434904271143 |
| 12 | 17012875405546305 |
| 13 | 884669521090002183 |
| 14 | 49541493181044905217 |
| 15 | 2972489590862708661927 |
| 16 | 190239333815213397410049 |
| 17 | 12936274699434511153023495 |