n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 36 |
3 | 224 |
4 | 1440 |
5 | 9504 |
6 | 64064 |
7 | 439296 |
8 | 3055104 |
9 | 21498880 |
10 | 152807424 |
11 | 1095450624 |
12 | 7911587840 |
13 | 57511157760 |
14 | 420459724800 |
15 | 3089600348160 |
16 | 22806128885760 |
17 | 169033661153280 |
18 | 1257467341701120 |
19 | 9385880636620800 |
20 | 70271680244613120 |
21 | 527595313582571520 |
[1,6,36,224,1440,9504,64064,439296,3055104, 21498880,152807424,1095450624,7911587840, 57511157760,420459724800,3089600348160, 22806128885760,169033661153280,1257467341701120, 9385880636620800,70271680244613120, 527595313582571520] |