n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 9 |
3 | 32 |
4 | 121 |
5 | 450 |
6 | 1681 |
7 | 6272 |
8 | 23409 |
9 | 87362 |
10 | 326041 |
11 | 1216800 |
12 | 4541161 |
13 | 16947842 |
14 | 63250209 |
15 | 236052992 |
16 | 880961761 |
17 | 3287794050 |
18 | 12270214441 |
19 | 45793063712 |
20 | 170902040409 |
21 | 637815097922 |
22 | 2380358351281 |
23 | 8883618307200 |
24 | 33154114877521 |
25 | 123732841202882 |
[1,2,9,32,121,450,1681,6272,23409,87362,326041, 1216800,4541161,16947842,63250209,236052992, 880961761,3287794050,12270214441,45793063712, 170902040409,637815097922,2380358351281, 8883618307200,33154114877521,123732841202882] |