n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 22 |
5 | 147 |
6 | 1074 |
7 | 8216 |
8 | 64798 |
9 | 521900 |
10 | 4272967 |
11 | 35447724 |
12 | 297308810 |
13 | 2516830890 |
14 | 21476307960 |
15 | 184530904560 |
16 | 1595190209002 |
17 | 13863857007924 |
18 | 121067796450692 |
19 | 1061770618201680 |
20 | 9347742325179544 |
21 | 82584606893075739 |
[1,1,4,22,147,1074,8216,64798,521900,4272967, 35447724,297308810,2516830890,21476307960, 184530904560,1595190209002,13863857007924, 121067796450692,1061770618201680,9347742325179544, 82584606893075739] |