n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 9 |
3 | 30 |
4 | 99 |
5 | 330 |
6 | 1098 |
7 | 3660 |
8 | 12195 |
9 | 40650 |
10 | 135486 |
11 | 451620 |
12 | 1505358 |
13 | 5017860 |
14 | 16726068 |
15 | 55753560 |
16 | 185844771 |
17 | 619482570 |
18 | 2064940470 |
19 | 6883134900 |
20 | 22943778138 |
21 | 76479260460 |
22 | 254930851404 |
23 | 849769504680 |
24 | 2832564956814 |
[1,3,9,30,99,330,1098,3660,12195,40650,135486, 451620,1505358,5017860,16726068,55753560, 185844771,619482570,2064940470,6883134900, 22943778138,76479260460,254930851404,849769504680, 2832564956814] |