n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 120 |
6 | 1080 |
7 | 6300 |
8 | 30240 |
9 | 130032 |
10 | 521640 |
11 | 1996500 |
12 | 7389360 |
13 | 26676936 |
14 | 94486392 |
15 | 329647500 |
16 | 1136116800 |
17 | 3876164832 |
18 | 13112135496 |
19 | 44031456900 |
20 | 146920942800 |
21 | 487489214520 |
22 | 1609441068312 |
23 | 5289755245500 |
24 | 17315399138400 |
25 | 56470807803600 |
26 | 183546483143400 |
[0,0,0,0,0,120,1080,6300,30240,130032,521640, 1996500,7389360,26676936,94486392,329647500, 1136116800,3876164832,13112135496,44031456900, 146920942800,487489214520,1609441068312, 5289755245500,17315399138400,56470807803600, 183546483143400] |