n | a(n) |
---|---|
0 | 1 |
1 | 15 |
2 | 128 |
3 | 816 |
4 | 4320 |
5 | 20064 |
6 | 84480 |
7 | 329472 |
8 | 1208064 |
9 | 4209920 |
10 | 14057472 |
11 | 45260800 |
12 | 141213696 |
13 | 428654592 |
14 | 1270087680 |
15 | 3683254272 |
16 | 10478223360 |
17 | 29297934336 |
18 | 80648077312 |
19 | 218864025600 |
20 | 586290298880 |
21 | 1551944908800 |
22 | 4063273943040 |
[1,15,128,816,4320,20064,84480,329472,1208064, 4209920,14057472,45260800,141213696,428654592, 1270087680,3683254272,10478223360,29297934336, 80648077312,218864025600,586290298880, 1551944908800,4063273943040] |