n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 21 |
3 | 142 |
4 | 1201 |
5 | 12336 |
6 | 149989 |
7 | 2113546 |
8 | 33926337 |
9 | 611660476 |
10 | 12243073621 |
11 | 269456124774 |
12 | 6468249055921 |
13 | 168191402251432 |
14 | 4709596238204901 |
15 | 141291441773619106 |
16 | 4521383010795364609 |
17 | 153727989225714801396 |
18 | 5534225015581836134677 |
[1,4,21,142,1201,12336,149989,2113546,33926337, 611660476,12243073621,269456124774,6468249055921, 168191402251432,4709596238204901, 141291441773619106,4521383010795364609, 153727989225714801396,5534225015581836134677] |