n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 3 |
4 | 13 |
5 | 53 |
6 | 2906 |
7 | 30391 |
8 | 306356 |
9 | 1544521 |
10 | 314487775 |
11 | 5311670611 |
12 | 71438659315 |
13 | 8643791799805 |
14 | 208502988236908 |
15 | 4525624184096751 |
16 | 55200677713457866 |
17 | 15583522643116493073 |
18 | 466115766638709659105 |
[1,0,3,13,53,2906,30391,306356,1544521,314487775, 5311670611,71438659315,8643791799805, 208502988236908,4525624184096751, 55200677713457866,15583522643116493073, 466115766638709659105] |