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 | 7 |
| 5 | 16 |
| 6 | 43 |
| 7 | 105 |
| 8 | 255 |
| 9 | 646 |
| 10 | 1547 |
| 11 | 3605 |
| 12 | 8241 |
| 13 | 19279 |
| 14 | 44706 |
| 15 | 105212 |
| 16 | 246683 |
| 17 | 585355 |
| 18 | 1401644 |
| 19 | 3381806 |
| 20 | 8220777 |
| 21 | 20138200 |
| 22 | 49679870 |