n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 12 |
4 | 37 |
5 | 139 |
6 | 511 |
7 | 1889 |
8 | 7386 |
9 | 29461 |
10 | 117067 |
11 | 474619 |
12 | 1967869 |
13 | 8140890 |
14 | 33951702 |
15 | 143818185 |
16 | 610812118 |
17 | 2601204085 |
18 | 11183931168 |
19 | 48341357130 |
20 | 209165014365 |
21 | 909994942656 |
22 | 3981103155218 |
23 | 17440110729635 |
24 | 76622866065120 |
25 | 338201784898856 |
26 | 1495882386211394 |
27 | 6626913097151153 |
[1,1,4,12,37,139,511,1889,7386,29461,117067, 474619,1967869,8140890,33951702,143818185, 610812118,2601204085,11183931168,48341357130, 209165014365,909994942656,3981103155218, 17440110729635,76622866065120,338201784898856, 1495882386211394,6626913097151153] |