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 | 6 |
| 2 | 54 |
| 3 | 630 |
| 4 | 8982 |
| 5 | 150966 |
| 6 | 2918934 |
| 7 | 63772470 |
| 8 | 1552910742 |
| 9 | 41690570166 |
| 10 | 1223096629014 |
| 11 | 38924237638710 |
| 12 | 1335418262833302 |
| 13 | 49129420920630966 |
| 14 | 1929262811804022294 |
| 15 | 80540656071983191350 |
| 16 | 3561781875173605408662 |
| 17 | 166331104582900651581366 |