n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 6 |
5 | 35 |
6 | 235 |
7 | 1834 |
8 | 16352 |
9 | 163764 |
10 | 1818030 |
11 | 22143726 |
12 | 293476326 |
13 | 4203311892 |
14 | 64682865156 |
15 | 1064154324024 |
16 | 18636296872320 |
17 | 346103784493560 |
18 | 6793394350116600 |
19 | 140508244952179200 |
20 | 3054120126193160280 |
21 | 69596730438090806880 |
22 | 1659041650323705102840 |
[1,0,0,1,6,35,235,1834,16352,163764,1818030, 22143726,293476326,4203311892,64682865156, 1064154324024,18636296872320,346103784493560, 6793394350116600,140508244952179200, 3054120126193160280,69596730438090806880, 1659041650323705102840] |