n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 0 |
4 | 2 |
5 | 10 |
6 | 0 |
7 | 0 |
8 | 0 |
9 | 40 |
10 | 52 |
11 | 152 |
12 | 260 |
13 | 1192 |
14 | 4144 |
15 | 18408 |
16 | 71552 |
17 | 312936 |
18 | 1498156 |
19 | 7854672 |
20 | 44923706 |
21 | 213840604 |
22 | 1156549592 |
[1,0,0,2,10,0,0,0,40,52,152,260,1192,4144,18408, 71552,312936,1498156,7854672,44923706,213840604, 1156549592] |