n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 0 |
4 | 1 |
5 | 4 |
6 | 16 |
7 | 56 |
8 | 197 |
9 | 680 |
10 | 2368 |
11 | 8272 |
12 | 29162 |
13 | 103544 |
14 | 370592 |
15 | 1335504 |
16 | 4844205 |
17 | 17672400 |
18 | 64810240 |
19 | 238795040 |
20 | 883585406 |
21 | 3281967832 |
22 | 12232957152 |
23 | 45740929104 |
24 | 171529130786 |
25 | 644950721584 |
26 | 2430970600576 |
27 | 9183671335776 |
28 | 34766765428852 |
29 | 131873955816880 |
[1,1,0,1,4,16,56,197,680,2368,8272,29162,103544, 370592,1335504,4844205,17672400,64810240, 238795040,883585406,3281967832,12232957152, 45740929104,171529130786,644950721584, 2430970600576,9183671335776,34766765428852, 131873955816880] |