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 | 3 |
| 3 | 14 |
| 4 | 27 |
| 5 | 194 |
| 6 | 1280 |
| 7 | 4087 |
| 8 | 17899 |
| 9 | 177410 |
| 10 | 1829004 |
| 11 | 6191393 |
| 12 | 39601452 |
| 13 | 221669681 |
| 14 | 3187238613 |
| 15 | 46728961697 |
| 16 | 184114626107 |
| 17 | 1217996265362 |
| 18 | 8854410188516 |
| 19 | 68536459359829 |
| 20 | 1305896806285888 |
| 21 | 26706311366603507 |
| 22 | 116616474061307483 |
| 23 | 879466953545771963 |