n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 14 |
3 | 60 |
4 | 225 |
5 | 796 |
6 | 2764 |
7 | 9304 |
8 | 30580 |
9 | 98700 |
10 | 313422 |
11 | 981548 |
12 | 3037473 |
13 | 9301620 |
14 | 28222000 |
15 | 84927760 |
16 | 253699285 |
17 | 752863840 |
18 | 2220831160 |
19 | 6515581600 |
20 | 19021079866 |
21 | 55276625304 |
22 | 159967084164 |
23 | 461150383400 |
24 | 1324652146775 |
25 | 3792447499916 |
26 | 10824189204014 |
[1,4,14,60,225,796,2764,9304,30580,98700,313422, 981548,3037473,9301620,28222000,84927760, 253699285,752863840,2220831160,6515581600, 19021079866,55276625304,159967084164,461150383400, 1324652146775,3792447499916,10824189204014] |