n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 12 |
3 | 57 |
4 | 300 |
5 | 1701 |
6 | 10206 |
7 | 63825 |
8 | 411096 |
9 | 2702349 |
10 | 17992506 |
11 | 120543561 |
12 | 808224372 |
13 | 5400815829 |
14 | 35868103734 |
15 | 236354531841 |
16 | 1544182760496 |
17 | 10001335837725 |
18 | 64233753928722 |
19 | 409298268016761 |
20 | 2589206145139596 |
[1,3,12,57,300,1701,10206,63825,411096,2702349, 17992506,120543561,808224372,5400815829, 35868103734,236354531841,1544182760496, 10001335837725,64233753928722,409298268016761, 2589206145139596] |