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 | 4 |
| 4 | 11 |
| 5 | 28 |
| 6 | 66 |
| 7 | 152 |
| 8 | 339 |
| 9 | 748 |
| 10 | 1622 |
| 11 | 3496 |
| 12 | 7454 |
| 13 | 15832 |
| 14 | 33380 |
| 15 | 70192 |
| 16 | 146819 |
| 17 | 306508 |
| 18 | 637326 |
| 19 | 1323272 |
| 20 | 2738922 |
| 21 | 5662600 |
| 22 | 11677916 |
| 23 | 24061264 |