n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 24 |
4 | 250 |
5 | 3744 |
6 | 73408 |
7 | 1768088 |
8 | 50468854 |
9 | 1664844040 |
10 | 62304622320 |
11 | 2607765903568 |
12 | 120696071556230 |
13 | 6120415124163512 |
14 | 337440974546042416 |
15 | 20096905939846645064 |
16 | 1285779618228281270718 |
17 | 87947859243850506008984 |
18 | 6404472598196204610148232 |
[1,1,4,24,250,3744,73408,1768088,50468854, 1664844040,62304622320,2607765903568, 120696071556230,6120415124163512, 337440974546042416,20096905939846645064, 1285779618228281270718,87947859243850506008984, 6404472598196204610148232] |