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 | 3 |
| 3 | 8 |
| 4 | 23 |
| 5 | 72 |
| 6 | 237 |
| 7 | 808 |
| 8 | 2830 |
| 9 | 10118 |
| 10 | 36779 |
| 11 | 135510 |
| 12 | 504935 |
| 13 | 1899494 |
| 14 | 7204238 |
| 15 | 27517766 |
| 16 | 105761937 |
| 17 | 408715018 |
| 18 | 1587169591 |
| 19 | 6190357852 |
| 20 | 24238696551 |
| 21 | 95244997612 |
| 22 | 375469654543 |
| 23 | 1484519159122 |
| 24 | 5885302251250 |
| 25 | 23389997790804 |
| 26 | 93172394487012 |