n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 4 |
3 | 9 |
4 | 24 |
5 | 90 |
6 | 225 |
7 | 756 |
8 | 2160 |
9 | 6561 |
10 | 19764 |
11 | 58806 |
12 | 177633 |
13 | 530712 |
14 | 1595052 |
15 | 4782969 |
16 | 14346720 |
17 | 43053282 |
18 | 129127041 |
19 | 387440172 |
20 | 1162241784 |
21 | 3486784401 |
22 | 10460412252 |
23 | 31380882462 |
24 | 94143533121 |
25 | 282429005040 |
26 | 847289140884 |
27 | 2541865828329 |
28 | 7625595890664 |
[1,0,4,9,24,90,225,756,2160,6561,19764,58806, 177633,530712,1595052,4782969,14346720,43053282, 129127041,387440172,1162241784,3486784401, 10460412252,31380882462,94143533121,282429005040, 847289140884,2541865828329,7625595890664] |