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 | 2 |
| 2 | 36 |
| 3 | 384 |
| 4 | 3528 |
| 5 | 30250 |
| 6 | 248832 |
| 7 | 1989806 |
| 8 | 15586704 |
| 9 | 120187008 |
| 10 | 915304500 |
| 11 | 6900949462 |
| 12 | 51599794176 |
| 13 | 383142771674 |
| 14 | 2828107288188 |
| 15 | 20768716848000 |
| 16 | 151840963183392 |
| 17 | 1105779284582146 |
| 18 | 8024954790380544 |
| 19 | 58059628319357318 |
| 20 | 418891171182561000 |
| 21 | 3014678940049375872 |
| 22 | 21646865272061272716 |