n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 0 |
4 | 2 |
5 | 10 |
6 | 0 |
7 | 0 |
8 | 4 |
9 | 32 |
10 | 76 |
11 | 196 |
12 | 632 |
13 | 3368 |
14 | 12532 |
15 | 79788 |
16 | 468286 |
17 | 2815088 |
18 | 18287968 |
19 | 126620984 |
20 | 938037664 |
21 | 7232141830 |
22 | 59774887344 |
[1,0,0,2,10,0,0,4,32,76,196,632,3368,12532,79788, 468286,2815088,18287968,126620984,938037664, 7232141830,59774887344] |