n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 3 |
4 | 2 |
5 | 25 |
6 | 94 |
7 | 721 |
8 | 3674 |
9 | 42561 |
10 | 291248 |
11 | 3628801 |
12 | 34254604 |
13 | 479001601 |
14 | 5337581534 |
15 | 88966701825 |
16 | 1140807642974 |
17 | 20922789888001 |
18 | 321094542593824 |
19 | 6402373705728001 |
20 | 109338195253235948 |
21 | 2457732174030848001 |
[1,0,3,2,25,94,721,3674,42561,291248,3628801, 34254604,479001601,5337581534,88966701825, 1140807642974,20922789888001,321094542593824, 6402373705728001,109338195253235948, 2457732174030848001] |