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 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 13 |
| 5 | 26 |
| 6 | 52 |
| 7 | 105 |
| 8 | 211 |
| 9 | 422 |
| 10 | 844 |
| 11 | 1689 |
| 12 | 3378 |
| 13 | 6757 |
| 14 | 13515 |
| 15 | 27030 |
| 16 | 54061 |
| 17 | 108122 |
| 18 | 216244 |
| 19 | 432489 |
| 20 | 864978 |
| 21 | 1729957 |
| 22 | 3459915 |
| 23 | 6919830 |
| 24 | 13839660 |
| 25 | 27679321 |
| 26 | 55358643 |
| 27 | 110717286 |
| 28 | 221434573 |
| 29 | 442869146 |
| 30 | 885738292 |
| 31 | 1771476585 |
| 32 | 3542953171 |