n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 20 |
4 | 160 |
5 | 1872 |
6 | 25024 |
7 | 348224 |
8 | 5055488 |
9 | 78571776 |
10 | 1332573184 |
11 | 24695206912 |
12 | 493816963072 |
13 | 10492449771520 |
14 | 234399640633344 |
15 | 5480635606908928 |
16 | 134015043318054912 |
17 | 3427700843478056960 |
18 | 91642829715498336256 |
19 | 2556218693498006929408 |
[0,1,4,20,160,1872,25024,348224,5055488,78571776, 1332573184,24695206912,493816963072, 10492449771520,234399640633344,5480635606908928, 134015043318054912,3427700843478056960, 91642829715498336256,2556218693498006929408] |