n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 2 |
4 | 64 |
5 | 1090 |
6 | 14000 |
7 | 153762 |
8 | 1533504 |
9 | 14356610 |
10 | 128722000 |
11 | 1119607522 |
12 | 9528462944 |
13 | 79817940930 |
14 | 660876543600 |
15 | 5424917141282 |
16 | 44246078560384 |
17 | 359144709794050 |
18 | 2904688464582800 |
19 | 23429048035827042 |
20 | 188593339362097824 |
[0,0,0,2,64,1090,14000,153762,1533504,14356610, 128722000,1119607522,9528462944,79817940930, 660876543600,5424917141282,44246078560384, 359144709794050,2904688464582800, 23429048035827042,188593339362097824] |