n | a(n) |
---|---|
2 | 1 |
3 | 6 |
4 | 29 |
5 | 132 |
6 | 591 |
7 | 2648 |
8 | 11970 |
9 | 54818 |
10 | 254868 |
11 | 1204042 |
12 | 5779861 |
13 | 28178306 |
14 | 139394333 |
15 | 698911166 |
16 | 3547422416 |
17 | 18204441884 |
18 | 94339586414 |
19 | 493148411592 |
20 | 2597699326194 |
21 | 13776442755524 |
22 | 73498738275926 |
23 | 394203045846692 |
[1,6,29,132,591,2648,11970,54818,254868,1204042, 5779861,28178306,139394333,698911166,3547422416, 18204441884,94339586414,493148411592, 2597699326194,13776442755524,73498738275926, 394203045846692] |