n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 120 |
7 | 2160 |
8 | 23940 |
9 | 211680 |
10 | 1643544 |
11 | 11748240 |
12 | 79419180 |
13 | 516257280 |
14 | 3262443120 |
15 | 20193277104 |
16 | 123071707080 |
17 | 741419995680 |
18 | 4427490147480 |
19 | 26264144909520 |
20 | 155018841055596 |
21 | 911509010154720 |
22 | 5344538384445120 |
23 | 31272099902089200 |
24 | 182707081122261480 |
[0,0,0,0,0,120,2160,23940,211680,1643544,11748240, 79419180,516257280,3262443120,20193277104, 123071707080,741419995680,4427490147480, 26264144909520,155018841055596,911509010154720, 5344538384445120,31272099902089200, 182707081122261480] |