n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 18 |
3 | 121 |
4 | 873 |
5 | 6606 |
6 | 51728 |
7 | 415629 |
8 | 3407391 |
9 | 28388847 |
10 | 239675406 |
11 | 2045980440 |
12 | 17629939980 |
13 | 153142537440 |
14 | 1339599358944 |
15 | 11789960853293 |
16 | 104327344928619 |
17 | 927627432162129 |
18 | 8283625668834238 |
19 | 74259685465582569 |
20 | 668054892245119353 |
[1,3,18,121,873,6606,51728,415629,3407391, 28388847,239675406,2045980440,17629939980, 153142537440,1339599358944,11789960853293, 104327344928619,927627432162129,8283625668834238, 74259685465582569,668054892245119353] |