n | a(n) |
---|---|
0 | 3 |
1 | 20 |
2 | 138 |
3 | 980 |
4 | 7122 |
5 | 52700 |
6 | 395418 |
7 | 2998820 |
8 | 22932642 |
9 | 176524460 |
10 | 1365982698 |
11 | 10616089460 |
12 | 82804904562 |
13 | 647865527420 |
14 | 5082373099578 |
15 | 39962451176900 |
16 | 314860495170882 |
17 | 2485193267125580 |
18 | 19646626804658058 |
19 | 155533156747557140 |
[3,20,138,980,7122,52700,395418,2998820,22932642, 176524460,1365982698,10616089460,82804904562, 647865527420,5082373099578,39962451176900, 314860495170882,2485193267125580, 19646626804658058,155533156747557140] |