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 | 0 |
| 1 | 9 |
| 2 | 1022 |
| 3 | 29523 |
| 4 | 349524 |
| 5 | 2441405 |
| 6 | 12093234 |
| 7 | 47079207 |
| 8 | 153391688 |
| 9 | 435848049 |
| 10 | 1111111110 |
| 11 | 2593742459 |
| 12 | 5628851292 |
| 13 | 11488207653 |
| 14 | 22250358074 |
| 15 | 41189313615 |
| 16 | 73300775184 |
| 17 | 125999618777 |
| 18 | 210027483918 |
| 19 | 340614792099 |
| 20 | 538947368420 |
| 21 | 833994048909 |
| 22 | 1264758228162 |