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 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 1 |
| 12 | 10 |
| 13 | 64 |
| 14 | 316 |
| 15 | 1336 |
| 16 | 5065 |
| 17 | 17774 |
| 18 | 58840 |
| 19 | 186322 |
| 20 | 569740 |
| 21 | 1694449 |
| 22 | 4927345 |
| 23 | 14067397 |
| 24 | 39554994 |
| 25 | 109815312 |
| 26 | 301618216 |
| 27 | 820875862 |
| 28 | 2216564889 |
| 29 | 5944589510 |
| 30 | 15848003806 |
| 31 | 42028780558 |
| 32 | 110941624229 |
| 33 | 291629971309 |