n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 30 |
4 | 143 |
5 | 671 |
6 | 3132 |
7 | 14601 |
8 | 68101 |
9 | 318035 |
10 | 1487661 |
11 | 6971222 |
12 | 32727472 |
13 | 153926409 |
14 | 725264305 |
15 | 3423262180 |
16 | 16185240446 |
17 | 76648901377 |
18 | 363557014067 |
19 | 1726994886004 |
20 | 8215502584008 |
21 | 39135887682617 |
22 | 186676023857041 |
23 | 891557875400175 |
[1,6,30,143,671,3132,14601,68101,318035,1487661, 6971222,32727472,153926409,725264305,3423262180, 16185240446,76648901377,363557014067, 1726994886004,8215502584008,39135887682617, 186676023857041,891557875400175] |