n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 3 |
5 | 3 |
6 | 8 |
7 | 30 |
8 | 117 |
9 | 466 |
10 | 1960 |
11 | 8655 |
12 | 40391 |
13 | 200085 |
14 | 1051888 |
15 | 5844844 |
16 | 34131049 |
17 | 208344660 |
18 | 1324262256 |
19 | 8743620525 |
20 | 59891078347 |
21 | 425216195191 |
22 | 3126418416440 |
23 | 23778261543210 |
24 | 186815245299549 |
25 | 1513931016854598 |
[1,0,0,1,3,3,8,30,117,466,1960,8655,40391,200085, 1051888,5844844,34131049,208344660,1324262256, 8743620525,59891078347,425216195191,3126418416440, 23778261543210,186815245299549,1513931016854598] |