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 | 6 |
| 2 | 120 |
| 3 | 2340 |
| 4 | 49315 |
| 5 | 1142932 |
| 6 | 29141994 |
| 7 | 814059798 |
| 8 | 24779916843 |
| 9 | 817506518829 |
| 10 | 29081010732059 |
| 11 | 1110248649302494 |
| 12 | 45298134089851175 |
| 13 | 1967550159430960784 |
| 14 | 90668183653348456484 |
| 15 | 4418855084158930131012 |
| 16 | 227122154996245283660487 |