n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 8 |
5 | 50 |
6 | 320 |
7 | 2275 |
8 | 18256 |
9 | 164388 |
10 | 1644000 |
11 | 18084165 |
12 | 217010200 |
13 | 2821132886 |
14 | 39495860768 |
15 | 592437911975 |
16 | 9479006592160 |
17 | 161143112067400 |
18 | 2900576017214016 |
19 | 55110944327067273 |
20 | 1102218886541346600 |
21 | 23146596617368279930 |
22 | 509225125582102160000 |
[0,0,0,1,8,50,320,2275,18256,164388,1644000, 18084165,217010200,2821132886,39495860768, 592437911975,9479006592160,161143112067400, 2900576017214016,55110944327067273, 1102218886541346600,23146596617368279930, 509225125582102160000] |