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 | 10 |
| 2 | 32 |
| 3 | 122 |
| 4 | 576 |
| 5 | 2922 |
| 6 | 14944 |
| 7 | 75994 |
| 8 | 384128 |
| 9 | 1933514 |
| 10 | 9706656 |
| 11 | 48651066 |
| 12 | 243609280 |
| 13 | 1219108906 |
| 14 | 6098732768 |
| 15 | 30503229338 |
| 16 | 152544844032 |
| 17 | 762810313098 |
| 18 | 3814309845280 |
| 19 | 19072324066810 |
| 20 | 95363944856384 |
| 21 | 476826697850090 |