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 | 11 |
| 3 | 34 |
| 4 | 173 |
| 5 | 586 |
| 6 | 2917 |
| 7 | 10262 |
| 8 | 50503 |
| 9 | 181334 |
| 10 | 885831 |
| 11 | 3221146 |
| 12 | 15652239 |
| 13 | 57405038 |
| 14 | 277822147 |
| 15 | 1025177314 |
| 16 | 4945846997 |
| 17 | 18333973274 |
| 18 | 88224662549 |
| 19 | 328195843910 |
| 20 | 1576001732485 |
| 21 | 5879010027618 |
| 22 | 28181895551161 |
| 23 | 105362519875518 |
| 24 | 504329070986033 |
| 25 | 1888952213601906 |