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) |
|---|---|
| 3 | 70 |
| 4 | 836 |
| 5 | 7192 |
| 6 | 73616 |
| 7 | 519712 |
| 8 | 3963968 |
| 9 | 33277312 |
| 10 | 263144192 |
| 11 | 2113834496 |
| 12 | 16995175424 |
| 13 | 135895635968 |
| 14 | 1093862207488 |
| 15 | 8752602423296 |
| 16 | 70102452125696 |
| 17 | 561472495910912 |
| 18 | 4494940873621504 |
| 19 | 35979456528646144 |
| 20 | 287952747599495168 |