n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 26 |
5 | 236 |
6 | 2752 |
7 | 39208 |
8 | 660032 |
9 | 12818912 |
10 | 282137824 |
11 | 6939897856 |
12 | 188666182784 |
13 | 5617349020544 |
14 | 181790703209728 |
15 | 6353726042486272 |
16 | 238513970965257728 |
17 | 9571020586419012608 |
18 | 408837905660444010496 |
19 | 18522305410364986906624 |
[0,1,1,4,26,236,2752,39208,660032,12818912, 282137824,6939897856,188666182784,5617349020544, 181790703209728,6353726042486272, 238513970965257728,9571020586419012608, 408837905660444010496,18522305410364986906624] |