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 | 22 |
| 3 | 250 |
| 4 | 3816 |
| 5 | 72968 |
| 6 | 1675568 |
| 7 | 44901456 |
| 8 | 1375306368 |
| 9 | 47392683648 |
| 10 | 1814635323648 |
| 11 | 76430014409472 |
| 12 | 3511792144942080 |
| 13 | 174806087920727040 |
| 14 | 9370642040786049024 |
| 15 | 538202280800536799232 |
| 16 | 32972397141008692445184 |
| 17 | 2146270648672407967137792 |