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 | 13 |
| 2 | 43 |
| 3 | 684 |
| 4 | 4749 |
| 5 | 49101 |
| 6 | 413786 |
| 7 | 3862849 |
| 8 | 34229311 |
| 9 | 311423874 |
| 10 | 2795565191 |
| 11 | 25267110999 |
| 12 | 227577191098 |
| 13 | 2053397764249 |
| 14 | 18510745379063 |
| 15 | 166945846438154 |
| 16 | 1505305762277273 |
| 17 | 13574575402532525 |
| 18 | 122405516285033798 |