n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 28 |
5 | 176 |
6 | 1600 |
7 | 16128 |
8 | 124416 |
9 | 1446336 |
10 | 35831808 |
11 | 1074954240 |
12 | 27136622592 |
13 | 711858585600 |
14 | 16840949760000 |
15 | 456855552000000 |
16 | 22466543616000000 |
[1,1,4,28,176,1600,16128,124416,1446336,35831808, 1074954240,27136622592,711858585600, 16840949760000,456855552000000,22466543616000000] |