n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 18 |
4 | 144 |
5 | 600 |
6 | 3600 |
7 | 44100 |
8 | 78400 |
9 | 635040 |
10 | 254016 |
11 | 12806640 |
12 | 153679680 |
13 | 1855133280 |
14 | 8657288640 |
15 | 16232416200 |
16 | 519437318400 |
17 | 8339854723200 |
18 | 150117385017600 |
19 | 541923759913536 |
20 | 516117866584320 |
[1,4,18,144,600,3600,44100,78400,635040,254016, 12806640,153679680,1855133280,8657288640, 16232416200,519437318400,8339854723200, 150117385017600,541923759913536,516117866584320] |