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 | 6 |
| 2 | 26 |
| 3 | 99 |
| 4 | 357 |
| 5 | 1203 |
| 6 | 3819 |
| 7 | 11496 |
| 8 | 33044 |
| 9 | 91067 |
| 10 | 241283 |
| 11 | 616618 |
| 12 | 1525908 |
| 13 | 3670422 |
| 14 | 8609234 |
| 15 | 19739642 |
| 16 | 44323092 |
| 17 | 97594520 |
| 18 | 210952363 |
| 19 | 448015366 |
| 20 | 935625977 |
| 21 | 1922870258 |
| 22 | 3891946458 |
| 23 | 7763818914 |
| 24 | 15275110988 |
| 25 | 29660831057 |