n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 18 |
5 | 33 |
6 | 111 |
7 | 690 |
8 | 1269 |
9 | 4292 |
10 | 26705 |
11 | 49118 |
12 | 166165 |
13 | 1033922 |
14 | 1901679 |
15 | 6433333 |
16 | 40029886 |
17 | 73626439 |
18 | 249076459 |
19 | 1549819116 |
20 | 2850561773 |
21 | 9643381402 |
22 | 60003650693 |
23 | 110363919984 |
24 | 373358466957 |
25 | 2323134396636 |
26 | 4272910326315 |
[1,1,1,3,18,33,111,690,1269,4292,26705,49118, 166165,1033922,1901679,6433333,40029886,73626439, 249076459,1549819116,2850561773,9643381402, 60003650693,110363919984,373358466957, 2323134396636,4272910326315] |