n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 4 |
4 | 5 |
5 | 48 |
6 | 252 |
7 | 1832 |
8 | 14625 |
9 | 132080 |
10 | 1323168 |
11 | 14576076 |
12 | 175108661 |
13 | 2278429216 |
14 | 31920719820 |
15 | 479088848976 |
16 | 7669098865441 |
17 | 130426934203296 |
18 | 2348478878321248 |
19 | 44633950190867220 |
20 | 892899715052136645 |
[1,0,0,4,5,48,252,1832,14625,132080,1323168, 14576076,175108661,2278429216,31920719820, 479088848976,7669098865441,130426934203296, 2348478878321248,44633950190867220, 892899715052136645] |