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n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 18 |
4 | 86 |
5 | 414 |
6 | 1998 |
7 | 9646 |
8 | 46574 |
9 | 224878 |
10 | 1085806 |
11 | 5242734 |
12 | 25314158 |
13 | 122227566 |
14 | 590166894 |
15 | 2849577838 |
16 | 13758978926 |
17 | 66434227054 |
18 | 320772823918 |
19 | 1548828203886 |
20 | 7478404111214 |
21 | 36108929260398 |
22 | 174349333486446 |
23 | 841833050987374 |
24 | 4064729537895278 |
[1,4,18,86,414,1998,9646,46574,224878,1085806, 5242734,25314158,122227566,590166894,2849577838, 13758978926,66434227054,320772823918, 1548828203886,7478404111214,36108929260398, 174349333486446,841833050987374,4064729537895278] |