n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 21 |
4 | 181 |
5 | 771 |
6 | 7728 |
7 | 34689 |
8 | 385632 |
9 | 1732971 |
10 | 21041598 |
11 | 92147697 |
12 | 1217109951 |
13 | 5099210686 |
14 | 73380609681 |
15 | 289623783084 |
16 | 4564472639880 |
17 | 16722146775195 |
18 | 290985244619874 |
19 | 974044248064611 |
20 | 18925364858562927 |
21 | 56848541164586820 |
22 | 1251693011560795635 |
[1,1,6,21,181,771,7728,34689,385632,1732971, 21041598,92147697,1217109951,5099210686, 73380609681,289623783084,4564472639880, 16722146775195,290985244619874,974044248064611, 18925364858562927,56848541164586820, 1251693011560795635] |