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 | 1 |
| 4 | 12 |
| 5 | 110 |
| 6 | 945 |
| 7 | 8092 |
| 8 | 70756 |
| 9 | 638423 |
| 10 | 5971350 |
| 11 | 57996774 |
| 12 | 585092607 |
| 13 | 6128147610 |
| 14 | 66579524648 |
| 15 | 749542556193 |
| 16 | 8733648533696 |
| 17 | 105203108066962 |
| 18 | 1308549777461505 |
| 19 | 16787682400875456 |
| 20 | 221901108871482760 |
| 21 | 3018891886411332135 |
| 22 | 42230736603244134242 |