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 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 62 |
| 5 | 739 |
| 6 | 11660 |
| 7 | 229003 |
| 8 | 5487341 |
| 9 | 157413957 |
| 10 | 5310060277 |
| 11 | 207442849742 |
| 12 | 9266622204859 |
| 13 | 468316344074444 |
| 14 | 26534795158872607 |
| 15 | 1672482335988644162 |
| 16 | 116473621430584439236 |
| 17 | 8908899406447047324336 |
| 18 | 744489132650874081005467 |