n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 52 |
4 | 206 |
5 | 734 |
6 | 4088 |
7 | 24801 |
8 | 130159 |
9 | 666434 |
10 | 3560105 |
11 | 19245643 |
12 | 102730864 |
13 | 546125038 |
14 | 2913904858 |
15 | 15571288925 |
16 | 83122383401 |
17 | 443489006259 |
18 | 2366877041892 |
19 | 12634189755271 |
20 | 67434790018093 |
21 | 359910312437155 |
22 | 1920940558913908 |
[1,4,52,206,734,4088,24801,130159,666434,3560105, 19245643,102730864,546125038,2913904858, 15571288925,83122383401,443489006259, 2366877041892,12634189755271,67434790018093, 359910312437155,1920940558913908] |