n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 6 |
4 | 12 |
5 | 320 |
6 | 2190 |
7 | 51492 |
8 | 685496 |
9 | 17286768 |
10 | 348213690 |
11 | 9956411300 |
12 | 266065478052 |
13 | 8737396913544 |
14 | 287741445880070 |
15 | 10816320294520860 |
16 | 420123621828718320 |
17 | 17913098835916877792 |
18 | 798053882730994171890 |
19 | 38192029991097097185108 |
20 | 1914946396460982552420380 |
[1,0,6,12,320,2190,51492,685496,17286768, 348213690,9956411300,266065478052,8737396913544, 287741445880070,10816320294520860, 420123621828718320,17913098835916877792, 798053882730994171890,38192029991097097185108, 1914946396460982552420380] |