n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 8 |
5 | 44 |
6 | 290 |
7 | 2194 |
8 | 18690 |
9 | 177072 |
10 | 1848048 |
11 | 21079332 |
12 | 260998584 |
13 | 3487438476 |
14 | 50030096844 |
15 | 767092681992 |
16 | 12520306878720 |
17 | 216760973139072 |
18 | 3967857438205320 |
19 | 76575231882844056 |
20 | 1553981718941428824 |
21 | 33082675130470434336 |
22 | 737250032464248840192 |
[0,1,1,2,8,44,290,2194,18690,177072,1848048, 21079332,260998584,3487438476,50030096844, 767092681992,12520306878720,216760973139072, 3967857438205320,76575231882844056, 1553981718941428824,33082675130470434336, 737250032464248840192] |