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 | 10 |
| 2 | 82 |
| 3 | 730 |
| 4 | 6562 |
| 5 | 59050 |
| 6 | 531442 |
| 7 | 4782970 |
| 8 | 43046722 |
| 9 | 387420490 |
| 10 | 3486784402 |
| 11 | 31381059610 |
| 12 | 282429536482 |
| 13 | 2541865828330 |
| 14 | 22876792454962 |
| 15 | 205891132094650 |
| 16 | 1853020188851842 |
| 17 | 16677181699666570 |
| 18 | 150094635296999122 |