n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 10 |
4 | 10 |
5 | 55 |
6 | -1 |
7 | 210 |
8 | 120 |
9 | 120 |
10 | 1485 |
11 | 2145 |
12 | -1 |
13 | 2080 |
14 | -1 |
15 | -1 |
16 | 56616 |
17 | 1326 |
18 | 12561 |
19 | -1 |
20 | 1540 |
21 | 1540 |
22 | 21736 |
23 | -1 |
24 | -1 |
25 | 52650 |
26 | 16653 |
27 | 4950 |
28 | 26796 |
29 | 10440 |
30 | 12880 |
31 | 7750 |
32 | -1 |
33 | -1 |
34 | 7140 |
35 | 7140 |
36 | 154290 |
37 | -1 |
38 | 11476 |
39 | -1 |
40 | 214840 |
41 | -1 |
42 | -1 |
43 | 207690 |
44 | 23252790 |
45 | -1 |
46 | -1 |
47 | 6895041 |
48 | -1 |
49 | 750925 |
[0,1,10,10,55,-1,210,120,120,1485,2145,-1,2080,-1, -1,56616,1326,12561,-1,1540,1540,21736,-1,-1, 52650,16653,4950,26796,10440,12880,7750,-1,-1, 7140,7140,154290,-1,11476,-1,214840,-1,-1,207690, 23252790,-1,-1,6895041,-1,750925] |