n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 3 |
4 | 40 |
5 | 205 |
6 | 2556 |
7 | 24409 |
8 | 347712 |
9 | 4794633 |
10 | 81163900 |
11 | 1434596581 |
12 | 28725779952 |
13 | 612610306477 |
14 | 14280306222924 |
15 | 354958921699425 |
16 | 9471543095892736 |
17 | 268347925179992593 |
18 | 8075532017006497404 |
19 | 256672899448317943453 |
20 | 8603440900030816095600 |
[1,0,2,3,40,205,2556,24409,347712,4794633, 81163900,1434596581,28725779952,612610306477, 14280306222924,354958921699425,9471543095892736, 268347925179992593,8075532017006497404, 256672899448317943453,8603440900030816095600] |