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) |
|---|---|
| 2 | 4 |
| 3 | 84 |
| 4 | 1340 |
| 5 | 19280 |
| 6 | 263284 |
| 7 | 3486224 |
| 8 | 45247084 |
| 9 | 579150012 |
| 10 | 7338291224 |
| 11 | 92272957568 |
| 12 | 1153361204996 |
| 13 | 14348020042512 |
| 14 | 177803262186064 |
| 15 | 2196338193610064 |
| 16 | 27057921450352204 |
| 17 | 332583930387073712 |