n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 6 |
3 | 18 |
4 | 48 |
5 | 132 |
6 | 360 |
7 | 984 |
8 | 2688 |
9 | 7344 |
10 | 20064 |
11 | 54816 |
12 | 149760 |
13 | 409152 |
14 | 1117824 |
15 | 3053952 |
16 | 8343552 |
17 | 22795008 |
18 | 62277120 |
19 | 170144256 |
20 | 464842752 |
21 | 1269974016 |
22 | 3469633536 |
23 | 9479215104 |
24 | 25897697280 |
25 | 70753824768 |
26 | 193303044096 |
27 | 528113737728 |
28 | 1442833563648 |
29 | 3941894602752 |
30 | 10769456332800 |
[0,3,6,18,48,132,360,984,2688,7344,20064,54816, 149760,409152,1117824,3053952,8343552,22795008, 62277120,170144256,464842752,1269974016, 3469633536,9479215104,25897697280,70753824768, 193303044096,528113737728,1442833563648, 3941894602752,10769456332800] |