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 | 3 |
| 2 | 7 |
| 3 | 24 |
| 4 | 247 |
| 5 | 765 |
| 6 | 1777 |
| 7 | 6096 |
| 8 | 62737 |
| 9 | 194307 |
| 10 | 451351 |
| 11 | 1548360 |
| 12 | 15934951 |
| 13 | 49353213 |
| 14 | 114641377 |
| 15 | 393277344 |
| 16 | 4047414817 |
| 17 | 12535521795 |
| 18 | 29118458407 |
| 19 | 99890897016 |
| 20 | 1028027428567 |
| 21 | 3183973182717 |
| 22 | 7395973794001 |