n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 4 |
4 | 12 |
5 | 33 |
6 | 90 |
7 | 252 |
8 | 729 |
9 | 2160 |
10 | 6480 |
11 | 19521 |
12 | 58806 |
13 | 176904 |
14 | 531441 |
15 | 1595052 |
16 | 4785156 |
17 | 14353281 |
18 | 43053282 |
19 | 129146724 |
20 | 387420489 |
21 | 1162241784 |
22 | 3486725352 |
23 | 10460235105 |
24 | 31380882462 |
25 | 94143001680 |
26 | 282429536481 |
27 | 847289140884 |
[0,0,1,4,12,33,90,252,729,2160,6480,19521,58806, 176904,531441,1595052,4785156,14353281,43053282, 129146724,387420489,1162241784,3486725352, 10460235105,31380882462,94143001680,282429536481, 847289140884] |