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 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 4 |
| 7 | 8 |
| 8 | 18 |
| 9 | 38 |
| 10 | 88 |
| 11 | 210 |
| 12 | 528 |
| 13 | 1396 |
| 14 | 3946 |
| 15 | 11896 |
| 16 | 38644 |
| 17 | 135790 |
| 18 | 518645 |
| 19 | 2160112 |
| 20 | 9832013 |
| 21 | 48945468 |
| 22 | 266458643 |