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 | 3 |
| 1 | 12 |
| 2 | 108 |
| 3 | 1332 |
| 4 | 19908 |
| 5 | 342252 |
| 6 | 6583788 |
| 7 | 139380372 |
| 8 | 3211960068 |
| 9 | 79950396492 |
| 10 | 2137119431148 |
| 11 | 61065403377012 |
| 12 | 1858069709657028 |
| 13 | 60006976422450732 |
| 14 | 2050924514408985708 |
| 15 | 73988085260209757652 |
| 16 | 2810535115787602525188 |