n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 6 |
4 | 22 |
5 | 70 |
6 | 215 |
7 | 652 |
8 | 1964 |
9 | 5900 |
10 | 17709 |
11 | 53138 |
12 | 159426 |
13 | 478290 |
14 | 1434883 |
15 | 4304664 |
16 | 12914008 |
17 | 38742040 |
18 | 116226137 |
19 | 348678430 |
20 | 1046035310 |
21 | 3138105950 |
22 | 9414317871 |
23 | 28242953636 |
24 | 84728860932 |
25 | 254186582820 |
[0,1,6,22,70,215,652,1964,5900,17709,53138,159426, 478290,1434883,4304664,12914008,38742040, 116226137,348678430,1046035310,3138105950, 9414317871,28242953636,84728860932,254186582820] |