n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 720 |
3 | 17640 |
4 | 726570 |
5 | 17236728 |
6 | 223847280 |
7 | 1928224440 |
8 | 12500672580 |
9 | 65073916440 |
10 | 284229347328 |
11 | 1080456070680 |
12 | 3650778821970 |
13 | 11191823745120 |
14 | 31612753519200 |
15 | 83017908015624 |
16 | 204808695842610 |
17 | 479043914067360 |
18 | 1065816689968080 |
19 | 2271147404056200 |
[1,0,720,17640,726570,17236728,223847280, 1928224440,12500672580,65073916440,284229347328, 1080456070680,3650778821970,11191823745120, 31612753519200,83017908015624,204808695842610, 479043914067360,1065816689968080,2271147404056200] |