n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 18 |
3 | 138 |
4 | 1050 |
5 | 7986 |
6 | 60738 |
7 | 461946 |
8 | 3513354 |
9 | 26720994 |
10 | 203227890 |
11 | 1545660138 |
12 | 11755597434 |
13 | 89407799058 |
14 | 679995600162 |
15 | 5171741404122 |
16 | 39333944432490 |
17 | 299156331247554 |
18 | 2275248816682962 |
19 | 17304521539721034 |
20 | 131610425867719386 |
21 | 1000969842322591986 |
[1,2,18,138,1050,7986,60738,461946,3513354, 26720994,203227890,1545660138,11755597434, 89407799058,679995600162,5171741404122, 39333944432490,299156331247554,2275248816682962, 17304521539721034,131610425867719386, 1000969842322591986] |