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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 4 |
| 5 | 10 |
| 6 | 22 |
| 7 | 47 |
| 8 | 98 |
| 9 | 200 |
| 10 | 404 |
| 11 | 813 |
| 12 | 1632 |
| 13 | 3270 |
| 14 | 6546 |
| 15 | 13099 |
| 16 | 26206 |
| 17 | 52420 |
| 18 | 104848 |
| 19 | 209705 |
| 20 | 419420 |
| 21 | 838850 |
| 22 | 1677710 |
| 23 | 3355431 |
| 24 | 6710874 |
| 25 | 13421760 |
| 26 | 26843532 |
| 27 | 53687077 |
| 28 | 107374168 |
| 29 | 214748350 |
| 30 | 429496714 |
| 31 | 858993443 |
| 32 | 1717986902 |