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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 12 |
| 6 | 25 |
| 7 | 50 |
| 8 | 102 |
| 9 | 204 |
| 10 | 409 |
| 11 | 818 |
| 12 | 1638 |
| 13 | 3276 |
| 14 | 6553 |
| 15 | 13106 |
| 16 | 26214 |
| 17 | 52428 |
| 18 | 104857 |
| 19 | 209714 |
| 20 | 419430 |
| 21 | 838860 |
| 22 | 1677721 |
| 23 | 3355442 |
| 24 | 6710886 |
| 25 | 13421772 |
| 26 | 26843545 |
| 27 | 53687090 |
| 28 | 107374182 |
| 29 | 214748364 |
| 30 | 429496729 |
| 31 | 858993458 |
| 32 | 1717986918 |
| 33 | 3435973836 |