n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 12 |
4 | 48 |
5 | 240 |
6 | 4320 |
7 | 50400 |
8 | 564480 |
9 | 9434880 |
10 | 166924800 |
11 | 2953843200 |
12 | 60354201600 |
13 | 1357490534400 |
14 | 31907254579200 |
15 | 808142759424000 |
16 | 22052620541952000 |
17 | 635257746579456000 |
18 | 19347973338710016000 |
[1,0,0,12,48,240,4320,50400,564480,9434880, 166924800,2953843200,60354201600,1357490534400, 31907254579200,808142759424000,22052620541952000, 635257746579456000,19347973338710016000] |