n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 3 |
4 | 56 |
5 | 390 |
6 | 6384 |
7 | 92400 |
8 | 1812768 |
9 | 38565072 |
10 | 949927680 |
11 | 25934040000 |
12 | 783458550720 |
13 | 25909868761920 |
14 | 930720395219328 |
15 | 36108805836317760 |
16 | 1504050682102456320 |
17 | 66964478742976711680 |
18 | 3173178938051223889920 |
19 | 159461567895099436047360 |
[1,0,2,3,56,390,6384,92400,1812768,38565072, 949927680,25934040000,783458550720,25909868761920, 930720395219328,36108805836317760, 1504050682102456320,66964478742976711680, 3173178938051223889920,159461567895099436047360] |