n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 30 |
4 | 168 |
5 | 1050 |
6 | 6336 |
7 | 39039 |
8 | 240240 |
9 | 1487772 |
10 | 9237800 |
11 | 57551494 |
12 | 359444736 |
13 | 2250244100 |
14 | 14115694320 |
15 | 88707831750 |
16 | 558368324640 |
17 | 3519726403710 |
18 | 22215931214400 |
19 | 140389620550410 |
20 | 888125492826000 |
21 | 5623962934819320 |
22 | 35645449061816880 |
23 | 226114365012465150 |
[0,1,4,30,168,1050,6336,39039,240240,1487772, 9237800,57551494,359444736,2250244100,14115694320, 88707831750,558368324640,3519726403710, 22215931214400,140389620550410,888125492826000, 5623962934819320,35645449061816880, 226114365012465150] |