n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 64 |
6 | 170 |
7 | 2988 |
8 | 14616 |
9 | 180192 |
10 | 1934712 |
11 | 21673200 |
12 | 300266736 |
13 | 4220710272 |
14 | 61785461712 |
15 | 1003589762784 |
16 | 17448621367680 |
17 | 327598207658496 |
18 | 6279739240655232 |
19 | 134169095009652480 |
20 | 2817563310900129024 |
21 | 64570676279407718400 |
22 | 1547773850801172960000 |
23 | 38824156236466815920640 |
[1,0,1,2,6,64,170,2988,14616,180192,1934712, 21673200,300266736,4220710272,61785461712, 1003589762784,17448621367680,327598207658496, 6279739240655232,134169095009652480, 2817563310900129024,64570676279407718400, 1547773850801172960000,38824156236466815920640] |