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 | 2 |
| 5 | 3 |
| 6 | 7 |
| 7 | 14 |
| 8 | 28 |
| 9 | 57 |
| 10 | 115 |
| 11 | 233 |
| 12 | 469 |
| 13 | 945 |
| 14 | 1902 |
| 15 | 3823 |
| 16 | 7680 |
| 17 | 15420 |
| 18 | 30948 |
| 19 | 62087 |
| 20 | 124518 |
| 21 | 249661 |
| 22 | 500457 |
| 23 | 1002986 |
| 24 | 2009771 |
| 25 | 4026532 |