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 | 2 |
| 3 | 42 |
| 4 | 1092 |
| 5 | 35420 |
| 6 | 1391280 |
| 7 | 64425438 |
| 8 | 3442573064 |
| 9 | 208710267480 |
| 10 | 14162980464360 |
| 11 | 1063958304188780 |
| 12 | 87677864005521636 |
| 13 | 7865449972066576656 |
| 14 | 763126447532235966816 |
| 15 | 79629871834780293333510 |