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 | 5 |
| 4 | 13 |
| 5 | 36 |
| 6 | 102 |
| 7 | 299 |
| 8 | 889 |
| 9 | 2698 |
| 10 | 8267 |
| 11 | 25684 |
| 12 | 80349 |
| 13 | 253872 |
| 14 | 806334 |
| 15 | 2580279 |
| 16 | 8290645 |
| 17 | 26794566 |
| 18 | 86881179 |
| 19 | 283034120 |
| 20 | 924521718 |
| 21 | 3031535538 |
| 22 | 9962795554 |