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 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 1 |
| 10 | 3 |
| 11 | 9 |
| 12 | 29 |
| 13 | 99 |
| 14 | 357 |
| 15 | 1351 |
| 16 | 5343 |
| 17 | 21992 |
| 18 | 93912 |
| 19 | 414848 |
| 20 | 1891264 |
| 21 | 8878972 |
| 22 | 42849860 |
| 23 | 212214460 |
| 24 | 1077052284 |
| 25 | 5594301872 |
| 26 | 29704267536 |
| 27 | 161055535088 |
| 28 | 890880956848 |
| 29 | 5022885935600 |
| 30 | 28843306388880 |
| 31 | 168562494708400 |
| 32 | 1001888980299056 |