n | a(n) |
---|---|
3 | 0 |
4 | 3 |
5 | 16 |
6 | 83 |
7 | 442 |
8 | 2420 |
9 | 13566 |
10 | 77539 |
11 | 450340 |
12 | 2650635 |
13 | 15777450 |
14 | 94815732 |
15 | 574518536 |
16 | 3506232184 |
17 | 21533144486 |
18 | 132980242755 |
19 | 825304177544 |
20 | 5144743785545 |
21 | 32199189658020 |
22 | 202252227085755 |
23 | 1274578959894450 |
24 | 8056409137803600 |
25 | 51063344718826440 |
[0,3,16,83,442,2420,13566,77539,450340,2650635, 15777450,94815732,574518536,3506232184, 21533144486,132980242755,825304177544, 5144743785545,32199189658020,202252227085755, 1274578959894450,8056409137803600, 51063344718826440] |