n | a(n) |
---|---|
0 | 2 |
1 | 6 |
2 | 18 |
3 | 52 |
4 | 145 |
5 | 400 |
6 | 1093 |
7 | 2977 |
8 | 8098 |
9 | 22021 |
10 | 59868 |
11 | 162748 |
12 | 442406 |
13 | 1202597 |
14 | 3269009 |
15 | 8886102 |
16 | 24154944 |
17 | 65659960 |
18 | 178482291 |
19 | 485165185 |
20 | 1318815724 |
[2,6,18,52,145,400,1093,2977,8098,22021,59868, 162748,442406,1202597,3269009,8886102,24154944, 65659960,178482291,485165185,1318815724] |