n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 20 |
4 | 128 |
5 | 1024 |
6 | 9856 |
7 | 110720 |
8 | 1421312 |
9 | 20525056 |
10 | 329334784 |
11 | 5812797440 |
12 | 111923560448 |
13 | 2334639652864 |
14 | 52444850814976 |
15 | 1262260748288000 |
16 | 32405895451246592 |
17 | 883950436237705216 |
18 | 25530268718794276864 |
[1,1,4,20,128,1024,9856,110720,1421312,20525056, 329334784,5812797440,111923560448,2334639652864, 52444850814976,1262260748288000,32405895451246592, 883950436237705216,25530268718794276864] |