n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 12 |
4 | 54 |
5 | 203 |
6 | 913 |
7 | 3791 |
8 | 17421 |
9 | 76369 |
10 | 357010 |
11 | 1610906 |
12 | 7618852 |
13 | 35049764 |
14 | 167219609 |
15 | 780154851 |
16 | 3746904339 |
17 | 17660665005 |
18 | 85252847312 |
19 | 405012623438 |
20 | 1962958881010 |
21 | 9384294780340 |
22 | 45630045874621 |
23 | 219250204141161 |
24 | 1068911354389637 |
25 | 5157484620366595 |
26 | 25199960350383735 |
27 | 122013300433826613 |
[1,1,4,12,54,203,913,3791,17421,76369,357010, 1610906,7618852,35049764,167219609,780154851, 3746904339,17660665005,85252847312,405012623438, 1962958881010,9384294780340,45630045874621, 219250204141161,1068911354389637,5157484620366595, 25199960350383735,122013300433826613] |