n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 0 |
4 | 1 |
5 | 2 |
6 | 7 |
7 | 27 |
8 | 126 |
9 | 664 |
10 | 3954 |
11 | 26190 |
12 | 190754 |
13 | 1514332 |
14 | 12998035 |
15 | 119803771 |
16 | 1178740932 |
17 | 12316480222 |
18 | 136060611189 |
19 | 1582930919092 |
20 | 19328253734491 |
[1,1,1,0,1,2,7,27,126,664,3954,26190,190754, 1514332,12998035,119803771,1178740932,12316480222, 136060611189,1582930919092,19328253734491] |