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 | 1 |
| 3 | 5 |
| 4 | 58 |
| 5 | 1274 |
| 6 | 41728 |
| 7 | 1912112 |
| 8 | 116346400 |
| 9 | 9059742176 |
| 10 | 877746364288 |
| 11 | 103483282967936 |
| 12 | 14581464284095744 |
| 13 | 2419278174185319680 |
| 14 | 466730664414683625472 |
| 15 | 103580258158369503481856 |
| 16 | 26198788829773597178540032 |