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 | 0 |
| 1 | 1 |
| 2 | 60 |
| 3 | 2195 |
| 4 | 29144 |
| 5 | 217045 |
| 6 | 1119796 |
| 7 | 4483815 |
| 8 | 14913200 |
| 9 | 43046889 |
| 10 | 111111340 |
| 11 | 261994491 |
| 12 | 573309320 |
| 13 | 1178278205 |
| 14 | 2295672484 |
| 15 | 4271485135 |
| 16 | 7635498336 |
| 17 | 13176431825 |
| 18 | 22039922460 |
| 19 | 35854190179 |
| 20 | 56888890680 |
| 21 | 88253340581 |
| 22 | 134141026580 |