n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 128 |
3 | 840 |
4 | 5560 |
5 | 36988 |
6 | 246840 |
7 | 1650808 |
8 | 11056590 |
9 | 74130748 |
10 | 497387482 |
11 | 3339002940 |
12 | 22423219250 |
13 | 150623072388 |
14 | 1011962290858 |
15 | 6799752144942 |
16 | 45694220498130 |
17 | 307084056184964 |
18 | 2063824981953422 |
19 | 13870824556736138 |
[1,20,128,840,5560,36988,246840,1650808,11056590, 74130748,497387482,3339002940,22423219250, 150623072388,1011962290858,6799752144942, 45694220498130,307084056184964,2063824981953422, 13870824556736138] |