n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 24 |
3 | 160 |
4 | 1120 |
5 | 8064 |
6 | 59136 |
7 | 439296 |
8 | 3294720 |
9 | 24893440 |
10 | 189190144 |
11 | 1444724736 |
12 | 11076222976 |
13 | 85201715200 |
14 | 657270374400 |
15 | 5082890895360 |
16 | 39392404439040 |
17 | 305870434467840 |
18 | 2378992268083200 |
19 | 18531097667174400 |
[1,4,24,160,1120,8064,59136,439296,3294720, 24893440,189190144,1444724736,11076222976, 85201715200,657270374400,5082890895360, 39392404439040,305870434467840,2378992268083200, 18531097667174400] |