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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 8 |
| 6 | 19 |
| 7 | 57 |
| 8 | 186 |
| 9 | 740 |
| 10 | 3389 |
| 11 | 18502 |
| 12 | 120221 |
| 13 | 932260 |
| 14 | 8596844 |
| 15 | 93762704 |
| 16 | 1201732437 |
| 17 | 17992683043 |
| 18 | 313098431306 |
| 19 | 6305419392541 |