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 | 11 |
| 2 | 89 |
| 3 | 755 |
| 4 | 6641 |
| 5 | 59291 |
| 6 | 532169 |
| 7 | 4785155 |
| 8 | 43053281 |
| 9 | 387440171 |
| 10 | 3486843449 |
| 11 | 31381236755 |
| 12 | 282430067921 |
| 13 | 2541867422651 |
| 14 | 22876797237929 |
| 15 | 205891146443555 |
| 16 | 1853020231898561 |
| 17 | 16677181828806731 |
| 18 | 150094635684419609 |