n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 13 |
4 | 51 |
5 | 183 |
6 | 771 |
7 | 3087 |
8 | 13601 |
9 | 59933 |
10 | 278797 |
11 | 1311719 |
12 | 6453606 |
13 | 32179898 |
14 | 166075956 |
15 | 871713213 |
16 | 4704669005 |
17 | 25831172649 |
18 | 145260890323 |
[1,4,13,51,183,771,3087,13601,59933,278797, 1311719,6453606,32179898,166075956,871713213, 4704669005,25831172649,145260890323] |