n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 12 |
3 | 54 |
4 | 240 |
5 | 1068 |
6 | 4752 |
7 | 21144 |
8 | 94080 |
9 | 418608 |
10 | 1862592 |
11 | 8287584 |
12 | 36875520 |
13 | 164077248 |
14 | 730060032 |
15 | 3248394624 |
16 | 14453698560 |
17 | 64311583488 |
18 | 286153731072 |
19 | 1273238091264 |
20 | 5665259827200 |
21 | 25207515491328 |
22 | 112160581619712 |
23 | 499057357461504 |
24 | 2220550593085440 |
25 | 9880317087264768 |
26 | 43962369535229952 |
[0,3,12,54,240,1068,4752,21144,94080,418608, 1862592,8287584,36875520,164077248,730060032, 3248394624,14453698560,64311583488,286153731072, 1273238091264,5665259827200,25207515491328, 112160581619712,499057357461504,2220550593085440, 9880317087264768,43962369535229952] |