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 | 2 |
| 2 | 4 |
| 3 | 10 |
| 4 | 29 |
| 5 | 94 |
| 6 | 364 |
| 7 | 1621 |
| 8 | 8255 |
| 9 | 47277 |
| 10 | 300962 |
| 11 | 2107479 |
| 12 | 16099922 |
| 13 | 133243363 |
| 14 | 1187555333 |
| 15 | 11340314638 |
| 16 | 115511502857 |
| 17 | 1250127378307 |
| 18 | 14325404633040 |
| 19 | 173276880401035 |
| 20 | 2206229765086251 |
| 21 | 29495119298584886 |
| 22 | 413097874985119467 |
| 23 | 6048684327982905454 |