n | a(n) |
---|---|
0 | 2 |
1 | 4 |
2 | 30 |
3 | 272 |
4 | 3522 |
5 | 55744 |
6 | 1066590 |
7 | 23750912 |
8 | 604935042 |
9 | 17328937984 |
10 | 551609685150 |
11 | 19313964388352 |
12 | 737740947722562 |
13 | 30527905292468224 |
14 | 1360427147514751710 |
15 | 64955605537174126592 |
16 | 3308161927353377294082 |
17 | 179013508069217017790464 |
18 | 10256718523496425979562270 |
[2,4,30,272,3522,55744,1066590,23750912,604935042, 17328937984,551609685150,19313964388352, 737740947722562,30527905292468224, 1360427147514751710,64955605537174126592, 3308161927353377294082,179013508069217017790464, 10256718523496425979562270] |