n | a(n) |
---|---|
0 | 1 |
1 | 12 |
2 | 105 |
3 | 840 |
4 | 6435 |
5 | 48048 |
6 | 352716 |
7 | 2558160 |
8 | 18386775 |
9 | 131231100 |
10 | 931395465 |
11 | 6580248480 |
12 | 46312074900 |
13 | 324897017760 |
14 | 2272989850440 |
15 | 15863901576864 |
16 | 110487596768703 |
17 | 768095592509700 |
18 | 5330949171823275 |
19 | 36945070220658600 |
20 | 255702514854135195 |
21 | 1767643865751234240 |
[1,12,105,840,6435,48048,352716,2558160,18386775, 131231100,931395465,6580248480,46312074900, 324897017760,2272989850440,15863901576864, 110487596768703,768095592509700,5330949171823275, 36945070220658600,255702514854135195, 1767643865751234240] |