n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 6 |
3 | 18 |
4 | 45 |
5 | 135 |
6 | 378 |
7 | 1134 |
8 | 3321 |
9 | 9963 |
10 | 29646 |
11 | 88938 |
12 | 266085 |
13 | 798255 |
14 | 2392578 |
15 | 7177734 |
16 | 21526641 |
17 | 64579923 |
18 | 193720086 |
19 | 581160258 |
20 | 1743421725 |
21 | 5230265175 |
22 | 15690618378 |
23 | 47071855134 |
24 | 141215033961 |
25 | 423645101883 |
[1,3,6,18,45,135,378,1134,3321,9963,29646,88938, 266085,798255,2392578,7177734,21526641,64579923, 193720086,581160258,1743421725,5230265175, 15690618378,47071855134,141215033961,423645101883] |