n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 6 |
3 | 61 |
4 | 660 |
5 | 8901 |
6 | 133266 |
7 | 2303865 |
8 | 43808040 |
9 | 928665225 |
10 | 21386693790 |
11 | 537861526965 |
12 | 14540730176700 |
13 | 423407835413325 |
14 | 13140639311294250 |
15 | 434929825450371825 |
16 | 15237733330856005200 |
17 | 565064979900590948625 |
18 | 22056613209702152061750 |
19 | 905913636742121921038125 |
[0,1,6,61,660,8901,133266,2303865,43808040, 928665225,21386693790,537861526965,14540730176700, 423407835413325,13140639311294250, 434929825450371825,15237733330856005200, 565064979900590948625,22056613209702152061750, 905913636742121921038125] |