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 | 3 |
| 1 | 13 |
| 2 | 91 |
| 3 | 757 |
| 4 | 6643 |
| 5 | 59293 |
| 6 | 532171 |
| 7 | 4785157 |
| 8 | 43053283 |
| 9 | 387440173 |
| 10 | 3486843451 |
| 11 | 31381236757 |
| 12 | 282430067923 |
| 13 | 2541867422653 |
| 14 | 22876797237931 |
| 15 | 205891146443557 |
| 16 | 1853020231898563 |
| 17 | 16677181828806733 |
| 18 | 150094635684419611 |