n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 12 |
3 | 40 |
4 | 120 |
5 | 336 |
6 | 896 |
7 | 2304 |
8 | 5760 |
9 | 14080 |
10 | 33792 |
11 | 79872 |
12 | 186368 |
13 | 430080 |
14 | 983040 |
15 | 2228224 |
16 | 5013504 |
17 | 11206656 |
18 | 24903680 |
19 | 55050240 |
20 | 121110528 |
21 | 265289728 |
22 | 578813952 |
23 | 1258291200 |
24 | 2726297600 |
25 | 5888802816 |
26 | 12683575296 |
27 | 27246198784 |
[1,3,12,40,120,336,896,2304,5760,14080,33792, 79872,186368,430080,983040,2228224,5013504, 11206656,24903680,55050240,121110528,265289728, 578813952,1258291200,2726297600,5888802816, 12683575296,27246198784] |