n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 14 |
4 | 48 |
5 | 162 |
6 | 1186 |
7 | 6918 |
8 | 39696 |
9 | 537170 |
10 | 3056574 |
11 | 25758438 |
12 | 355775778 |
13 | 3541870438 |
14 | 26985605042 |
15 | 248862069474 |
16 | 6053773511696 |
17 | 46393386523698 |
18 | 511397173220686 |
19 | 4891387087110678 |
20 | 118913797103152638 |
[1,2,4,14,48,162,1186,6918,39696,537170,3056574, 25758438,355775778,3541870438,26985605042, 248862069474,6053773511696,46393386523698, 511397173220686,4891387087110678, 118913797103152638] |