n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 6 |
4 | 24 |
5 | 152 |
6 | 1230 |
7 | 12646 |
8 | 141274 |
9 | 1730984 |
10 | 23920800 |
11 | 379364664 |
12 | 6766026168 |
13 | 131337466608 |
14 | 2713274041296 |
15 | 59397879195456 |
16 | 1386647548658496 |
17 | 34745321580075648 |
18 | 934708252265232768 |
19 | 26835517455387452928 |
20 | 815158892950448937984 |
[0,1,1,6,24,152,1230,12646,141274,1730984, 23920800,379364664,6766026168,131337466608, 2713274041296,59397879195456,1386647548658496, 34745321580075648,934708252265232768, 26835517455387452928,815158892950448937984] |