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 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 5 |
| 7 | 8 |
| 8 | 18 |
| 9 | 39 |
| 10 | 91 |
| 11 | 185 |
| 12 | 460 |
| 13 | 1051 |
| 14 | 2526 |
| 15 | 6280 |
| 16 | 15645 |
| 17 | 35516 |
| 18 | 93765 |
| 19 | 225989 |
| 20 | 611503 |