n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 5 |
5 | 22 |
6 | 90 |
7 | 359 |
8 | 1415 |
9 | 5545 |
10 | 21670 |
11 | 84591 |
12 | 330121 |
13 | 1288587 |
14 | 5032235 |
15 | 19664205 |
16 | 76893687 |
17 | 300895513 |
18 | 1178290263 |
19 | 4617369760 |
20 | 18106447251 |
21 | 71048746505 |
22 | 278966179936 |
23 | 1095987764828 |
24 | 4308300939450 |
25 | 16944940572831 |
26 | 66680029591816 |
27 | 262519664110588 |
[1,0,0,1,5,22,90,359,1415,5545,21670,84591,330121, 1288587,5032235,19664205,76893687,300895513, 1178290263,4617369760,18106447251,71048746505, 278966179936,1095987764828,4308300939450, 16944940572831,66680029591816,262519664110588] |