n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 15 |
4 | 112 |
5 | 925 |
6 | 8556 |
7 | 88249 |
8 | 1007056 |
9 | 12612681 |
10 | 172092340 |
11 | 2541367741 |
12 | 40385290584 |
13 | 687120886621 |
14 | 12461362029676 |
15 | 239945693311185 |
16 | 4888311943969696 |
17 | 105038684764873489 |
18 | 2373935421890157156 |
19 | 56288808913905658981 |
20 | 1397063652149884343080 |
21 | 36219993180755369947941 |
[0,0,2,15,112,925,8556,88249,1007056,12612681, 172092340,2541367741,40385290584,687120886621, 12461362029676,239945693311185,4888311943969696, 105038684764873489,2373935421890157156, 56288808913905658981,1397063652149884343080, 36219993180755369947941] |