n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 0 |
3 | 2 |
4 | 7 |
5 | 69 |
6 | 696 |
7 | 9400 |
8 | 148506 |
9 | 2753793 |
10 | 58255840 |
11 | 1388008566 |
12 | 36768832200 |
13 | 1072407094693 |
14 | 34151921130432 |
15 | 1179292944433500 |
16 | 43892264744070736 |
17 | 1751768399754149025 |
18 | 74633720517351765504 |
19 | 3380997879130123703818 |
20 | 162286529338732345488000 |
21 | 8227876237310253918100581 |
[0,1,0,2,7,69,696,9400,148506,2753793,58255840, 1388008566,36768832200,1072407094693, 34151921130432,1179292944433500,43892264744070736, 1751768399754149025,74633720517351765504, 3380997879130123703818,162286529338732345488000, 8227876237310253918100581] |