n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 7 |
4 | 16 |
5 | 39 |
6 | 105 |
7 | 315 |
8 | 1048 |
9 | 3829 |
10 | 15207 |
11 | 65071 |
12 | 297840 |
13 | 1449755 |
14 | 7468541 |
15 | 40555747 |
16 | 231335960 |
17 | 1381989881 |
18 | 8623700811 |
19 | 56078446615 |
20 | 379233142800 |
21 | 2662013133295 |
22 | 19362917622001 |
23 | 145719550012299 |
24 | 1133023004941272 |
25 | 9090156910550109 |
26 | 75161929739797519 |
[0,1,3,7,16,39,105,315,1048,3829,15207,65071, 297840,1449755,7468541,40555747,231335960, 1381989881,8623700811,56078446615,379233142800, 2662013133295,19362917622001,145719550012299, 1133023004941272,9090156910550109, 75161929739797519] |