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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 14 |
| 5 | 38 |
| 6 | 118 |
| 7 | 338 |
| 8 | 1006 |
| 9 | 2990 |
| 10 | 8974 |
| 11 | 26862 |
| 12 | 80510 |
| 13 | 241390 |
| 14 | 723934 |
| 15 | 2171046 |
| 16 | 6512910 |
| 17 | 19536974 |
| 18 | 58608782 |
| 19 | 175821710 |
| 20 | 527470318 |
| 21 | 1582385678 |
| 22 | 4747139342 |
| 23 | 14241362318 |
| 24 | 42724100334 |
| 25 | 128172182990 |
| 26 | 384516408110 |
| 27 | 1153548740206 |
| 28 | 3460645850030 |
| 29 | 10381936700110 |