n | a(n) |
---|---|
1 | 2 |
2 | 2 |
3 | 4 |
4 | 28 |
5 | 234 |
6 | 2834 |
7 | 37862 |
8 | 645798 |
9 | 12252314 |
10 | 269821766 |
11 | 6611057718 |
12 | 180775499686 |
13 | 5412970783146 |
14 | 177123000526346 |
15 | 6268987640931794 |
16 | 239030133031899966 |
17 | 9760054909767135992 |
18 | 425094158160031535196 |
[2,2,4,28,234,2834,37862,645798,12252314, 269821766,6611057718,180775499686,5412970783146, 177123000526346,6268987640931794, 239030133031899966,9760054909767135992, 425094158160031535196] |