n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 2 |
3 | 14 |
4 | 18 |
5 | 62 |
6 | 566 |
7 | 1094 |
8 | 3954 |
9 | 17150 |
10 | 646182 |
11 | 1460054 |
12 | 7152294 |
13 | 32145622 |
14 | 215489878 |
15 | 15152657534 |
16 | 41699885554 |
17 | 237383066942 |
18 | 1205858271302 |
19 | 7890800135702 |
20 | 63929081762358 |
21 | 8131982041916390 |
22 | 26062267807810918 |
[1,2,2,14,18,62,566,1094,3954,17150,646182, 1460054,7152294,32145622,215489878,15152657534, 41699885554,237383066942,1205858271302, 7890800135702,63929081762358,8131982041916390, 26062267807810918] |