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 | 4 |
| 4 | 7 |
| 5 | 17 |
| 6 | 31 |
| 7 | 76 |
| 8 | 156 |
| 9 | 352 |
| 10 | 784 |
| 11 | 1674 |
| 12 | 3962 |
| 13 | 8129 |
| 14 | 20173 |
| 15 | 43193 |
| 16 | 103522 |
| 17 | 230536 |
| 18 | 535294 |
| 19 | 1231484 |
| 20 | 2787700 |
| 21 | 6591350 |
| 22 | 14613710 |
| 23 | 35369380 |
| 24 | 77886902 |
| 25 | 190329098 |
| 26 | 428113940 |
| 27 | 1027180798 |
| 28 | 2353823912 |
| 29 | 5559635866 |
| 30 | 12950837432 |