n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 26 |
3 | 181 |
4 | 1095 |
5 | 6416 |
6 | 35285 |
7 | 187929 |
8 | 973404 |
9 | 4934952 |
10 | 24628655 |
11 | 121375817 |
12 | 592337729 |
13 | 2868086641 |
14 | 13798982719 |
15 | 66043675287 |
16 | 314715355786 |
17 | 1494166794434 |
18 | 7071357084444 |
19 | 33374079939405 |
[1,4,26,181,1095,6416,35285,187929,973404,4934952, 24628655,121375817,592337729,2868086641, 13798982719,66043675287,314715355786, 1494166794434,7071357084444,33374079939405] |