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 | 2 |
| 3 | 7 |
| 4 | 34 |
| 5 | 638 |
| 6 | 4876 |
| 7 | 220217 |
| 8 | 6885458 |
| 9 | 569311642 |
| 10 | 7515775348 |
| 11 | 197394815194 |
| 12 | 78863079581996 |
| 13 | 886395722771204 |
| 14 | 848070074996694008 |
| 15 | 222148423805582000341 |
| 16 | 33494470531439170224754 |
| 17 | 35665304857619152523926 |
| 18 | 280147437461017444466304484 |