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 | 0 |
| 2 | 1 |
| 3 | 27 |
| 4 | 744 |
| 5 | 26520 |
| 6 | 1239840 |
| 7 | 74662560 |
| 8 | 5663831040 |
| 9 | 530098007040 |
| 10 | 60105991680000 |
| 11 | 8127440487936000 |
| 12 | 1292894601191424000 |
| 13 | 239129895342514176000 |
| 14 | 50899158690744139776000 |
| 15 | 12356174324714508288000000 |
| 16 | 3393918280427832764006400000 |
| 17 | 1047355019625604129593753600000 |