n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 2 |
3 | 28 |
4 | 54 |
5 | 860 |
6 | 2004 |
7 | 33720 |
8 | 86054 |
9 | 1492908 |
10 | 4019452 |
11 | 71101832 |
12 | 198310460 |
13 | 3555617432 |
14 | 10168382696 |
15 | 184127171952 |
16 | 536496907782 |
17 | 9788598556876 |
18 | 28937139277804 |
19 | 531135371147368 |
20 | 1588378827366868 |
21 | 29295861148032584 |
22 | 88439788292856856 |
23 | 1637711104368641552 |
[1,2,2,28,54,860,2004,33720,86054,1492908,4019452, 71101832,198310460,3555617432,10168382696, 184127171952,536496907782,9788598556876, 28937139277804,531135371147368,1588378827366868, 29295861148032584,88439788292856856, 1637711104368641552] |