n | a(n) |
---|---|
1 | 0 |
2 | 3 |
3 | 18 |
4 | 105 |
5 | 612 |
6 | 3567 |
7 | 20790 |
8 | 121173 |
9 | 706248 |
10 | 4116315 |
11 | 23991642 |
12 | 139833537 |
13 | 815009580 |
14 | 4750223943 |
15 | 27686334078 |
16 | 161367780525 |
17 | 940520349072 |
18 | 5481754313907 |
19 | 31950005534370 |
20 | 186218278892313 |
21 | 1085359667819508 |
22 | 6325939728024735 |
23 | 36870278700328902 |
24 | 214895732473948677 |
[0,3,18,105,612,3567,20790,121173,706248,4116315, 23991642,139833537,815009580,4750223943, 27686334078,161367780525,940520349072, 5481754313907,31950005534370,186218278892313, 1085359667819508,6325939728024735, 36870278700328902,214895732473948677] |