n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 9 |
3 | 46 |
4 | 293 |
5 | 1806 |
6 | 11538 |
7 | 74173 |
8 | 482157 |
9 | 3154645 |
10 | 20762014 |
11 | 137270376 |
12 | 911111522 |
13 | 6067104434 |
14 | 40514133081 |
15 | 271195540971 |
16 | 1819188150365 |
17 | 12225956834430 |
18 | 82301499780885 |
19 | 554850642658483 |
20 | 3745615502285478 |
21 | 25315915432984852 |
22 | 171292993893095996 |
[1,1,9,46,293,1806,11538,74173,482157,3154645, 20762014,137270376,911111522,6067104434, 40514133081,271195540971,1819188150365, 12225956834430,82301499780885,554850642658483, 3745615502285478,25315915432984852, 171292993893095996] |