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 | 2 |
| 1 | 12 |
| 2 | 90 |
| 3 | 756 |
| 4 | 6642 |
| 5 | 59292 |
| 6 | 532170 |
| 7 | 4785156 |
| 8 | 43053282 |
| 9 | 387440172 |
| 10 | 3486843450 |
| 11 | 31381236756 |
| 12 | 282430067922 |
| 13 | 2541867422652 |
| 14 | 22876797237930 |
| 15 | 205891146443556 |
| 16 | 1853020231898562 |
| 17 | 16677181828806732 |
| 18 | 150094635684419610 |