n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 20 |
6 | 180 |
7 | 840 |
8 | 1715 |
9 | 2520 |
10 | 88200 |
11 | 1940400 |
12 | 29111775 |
13 | 303603300 |
14 | 2188286100 |
15 | 12549537000 |
16 | 143029511625 |
17 | 3397035642000 |
18 | 71419225878000 |
19 | 1170096883956000 |
20 | 15075357741068625 |
21 | 163540869094102500 |
22 | 2025016641129982500 |
23 | 40912918773391665000 |
[1,0,0,0,1,20,180,840,1715,2520,88200,1940400, 29111775,303603300,2188286100,12549537000, 143029511625,3397035642000,71419225878000, 1170096883956000,15075357741068625, 163540869094102500,2025016641129982500, 40912918773391665000] |