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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 4 |
| 7 | 8 |
| 8 | 15 |
| 9 | 30 |
| 10 | 60 |
| 11 | 120 |
| 12 | 241 |
| 13 | 482 |
| 14 | 964 |
| 15 | 1928 |
| 16 | 3855 |
| 17 | 7710 |
| 18 | 15420 |
| 19 | 30840 |
| 20 | 61681 |
| 21 | 123362 |
| 22 | 246724 |
| 23 | 493448 |
| 24 | 986895 |
| 25 | 1973790 |
| 26 | 3947580 |
| 27 | 7895160 |
| 28 | 15790321 |
| 29 | 31580642 |
| 30 | 63161284 |
| 31 | 126322568 |
| 32 | 252645135 |