n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 42 |
4 | 888 |
5 | 31920 |
6 | 1750320 |
7 | 136115280 |
8 | 14254007040 |
9 | 1934091250560 |
10 | 330078373228800 |
11 | 69199130042380800 |
12 | 17481751115946163200 |
13 | 5237838647954514201600 |
14 | 1836425205487182172262400 |
15 | 744852154338379227748608000 |
16 | 346052141662324885396697088000 |
17 | 182572078442025253754006986752000 |
[1,1,4,42,888,31920,1750320,136115280,14254007040, 1934091250560,330078373228800,69199130042380800, 17481751115946163200,5237838647954514201600, 1836425205487182172262400, 744852154338379227748608000, 346052141662324885396697088000, 182572078442025253754006986752000] |