n | a(n) |
---|---|
1 | 0 |
2 | 4 |
3 | 135 |
4 | 1368 |
5 | 7350 |
6 | 28400 |
7 | 89073 |
8 | 241220 |
9 | 585057 |
10 | 1301420 |
11 | 2699125 |
12 | 5282172 |
13 | 9842430 |
14 | 17584416 |
15 | 30289835 |
16 | 50530680 |
17 | 81940901 |
18 | 129557940 |
19 | 200246795 |
20 | 303220720 |
21 | 450674190 |
22 | 658545360 |
23 | 947426925 |
24 | 1343646044 |
25 | 1880535825 |
26 | 2599922780 |
27 | 3553856649 |
28 | 4806611060 |
[0,4,135,1368,7350,28400,89073,241220,585057, 1301420,2699125,5282172,9842430,17584416,30289835, 50530680,81940901,129557940,200246795,303220720, 450674190,658545360,947426925,1343646044, 1880535825,2599922780,3553856649,4806611060] |