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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 13 |
| 6 | 26 |
| 7 | 53 |
| 8 | 106 |
| 9 | 211 |
| 10 | 422 |
| 11 | 845 |
| 12 | 1689 |
| 13 | 3379 |
| 14 | 6758 |
| 15 | 13515 |
| 16 | 27031 |
| 17 | 54061 |
| 18 | 108122 |
| 19 | 216245 |
| 20 | 432489 |
| 21 | 864979 |
| 22 | 1729958 |
| 23 | 3459915 |
| 24 | 6919830 |
| 25 | 13839661 |
| 26 | 27679322 |
| 27 | 55358643 |
| 28 | 110717287 |
| 29 | 221434573 |
| 30 | 442869146 |
| 31 | 885738293 |
| 32 | 1771476586 |
| 33 | 3542953171 |