n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 11 |
4 | 40 |
5 | 185 |
6 | 1030 |
7 | 6785 |
8 | 51160 |
9 | 438425 |
10 | 4176250 |
11 | 44098925 |
12 | 507867100 |
13 | 6375156125 |
14 | 86130937750 |
15 | 1253044612625 |
16 | 19429666282000 |
17 | 321457635604625 |
18 | 5626346310003250 |
19 | 104323833636303125 |
20 | 2034312191276462500 |
[1,2,4,11,40,185,1030,6785,51160,438425,4176250, 44098925,507867100,6375156125,86130937750, 1253044612625,19429666282000,321457635604625, 5626346310003250,104323833636303125, 2034312191276462500] |