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 | 13 |
| 2 | 129 |
| 3 | 1157 |
| 4 | 9881 |
| 5 | 82173 |
| 6 | 673009 |
| 7 | 5462197 |
| 8 | 44088201 |
| 9 | 354658733 |
| 10 | 2847035489 |
| 11 | 22825112037 |
| 12 | 182845036921 |
| 13 | 1463980998493 |
| 14 | 11717951503569 |
| 15 | 93774129606677 |
| 16 | 750345624744041 |
| 17 | 6003527937405453 |
| 18 | 48032038196509249 |