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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 13 |
| 5 | 41 |
| 6 | 226 |
| 7 | 1072 |
| 8 | 9059 |
| 9 | 58123 |
| 10 | 657766 |
| 11 | 5268836 |
| 12 | 73980787 |
| 13 | 707506879 |
| 14 | 11823958238 |
| 15 | 131277234376 |
| 16 | 2542107619081 |
| 17 | 32122718085497 |
| 18 | 706963537444114 |
| 19 | 10015472595953908 |
| 20 | 246853433179370621 |
| 21 | 3874536631479770761 |
| 22 | 105709617658879558402 |