n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 8 |
6 | 38 |
7 | 326 |
8 | 2160 |
9 | 13672 |
10 | 108016 |
11 | 1647056 |
12 | 13919360 |
13 | 184552992 |
14 | 2364307504 |
15 | 35702423952 |
16 | 561395873376 |
17 | 8826779987168 |
18 | 155426050764608 |
19 | 2946685004213600 |
20 | 55885619348013312 |
[1,1,1,4,8,38,326,2160,13672,108016,1647056, 13919360,184552992,2364307504,35702423952, 561395873376,8826779987168,155426050764608, 2946685004213600,55885619348013312] |