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 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 13 |
| 6 | 44 |
| 7 | 75 |
| 8 | 308 |
| 9 | 541 |
| 10 | 2612 |
| 11 | 4683 |
| 12 | 25988 |
| 13 | 47293 |
| 14 | 296564 |
| 15 | 545835 |
| 16 | 3816548 |
| 17 | 7087261 |
| 18 | 54667412 |
| 19 | 102247563 |
| 20 | 862440068 |
| 21 | 1622632573 |
| 22 | 14857100084 |
| 23 | 28091567595 |
| 24 | 277474957988 |
| 25 | 526858348381 |
| 26 | 5584100659412 |
| 27 | 10641342970443 |
| 28 | 120462266974148 |
| 29 | 230283190977853 |