n | a(n) |
---|---|
4 | 1 |
5 | 20 |
6 | 130 |
7 | 576 |
8 | 2218 |
9 | 8170 |
10 | 29830 |
11 | 109192 |
12 | 402258 |
13 | 1492746 |
14 | 5578742 |
15 | 20986424 |
16 | 79420122 |
17 | 302175648 |
18 | 1155298598 |
19 | 4436375790 |
20 | 17103294308 |
21 | 66174208076 |
22 | 256870951048 |
23 | 1000080994758 |
24 | 3904276709604 |
25 | 15280413966512 |
[1,20,130,576,2218,8170,29830,109192,402258, 1492746,5578742,20986424,79420122,302175648, 1155298598,4436375790,17103294308,66174208076, 256870951048,1000080994758,3904276709604, 15280413966512] |