n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 7 |
5 | 32 |
6 | 177 |
7 | 1142 |
8 | 8411 |
9 | 69692 |
10 | 642581 |
11 | 6534978 |
12 | 72754927 |
13 | 880877928 |
14 | 11530686953 |
15 | 162331760494 |
16 | 2446380427331 |
17 | 39300220067668 |
18 | 670480457586813 |
19 | 12106985274788506 |
20 | 230691361507912471 |
21 | 4625811718758963136 |
[0,0,1,2,7,32,177,1142,8411,69692,642581,6534978, 72754927,880877928,11530686953,162331760494, 2446380427331,39300220067668,670480457586813, 12106985274788506,230691361507912471, 4625811718758963136] |