n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 180 |
3 | 1264 |
4 | 7808 |
5 | 44544 |
6 | 240640 |
7 | 1249280 |
8 | 6291456 |
9 | 30932992 |
10 | 149159936 |
11 | 707788800 |
12 | 3313500160 |
13 | 15334375424 |
14 | 70262980608 |
15 | 319169757184 |
16 | 1438814044160 |
17 | 6442450944000 |
18 | 28673201668096 |
19 | 126924873531392 |
20 | 559101662724096 |
21 | 2451910929940480 |
22 | 10709243254538240 |
23 | 46601700831657984 |
[1,20,180,1264,7808,44544,240640,1249280,6291456, 30932992,149159936,707788800,3313500160, 15334375424,70262980608,319169757184, 1438814044160,6442450944000,28673201668096, 126924873531392,559101662724096,2451910929940480, 10709243254538240,46601700831657984] |