n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 26 |
4 | 240 |
5 | 2882 |
6 | 42560 |
7 | 745418 |
8 | 15097600 |
9 | 347066882 |
10 | 8926258176 |
11 | 253930611002 |
12 | 7916100448256 |
13 | 268352394448322 |
14 | 9828088361009152 |
15 | 386707997366768618 |
16 | 16268790735900180480 |
17 | 728714136550643404802 |
18 | 34624041592426892361728 |
[2,4,26,240,2882,42560,745418,15097600,347066882, 8926258176,253930611002,7916100448256, 268352394448322,9828088361009152, 386707997366768618,16268790735900180480, 728714136550643404802,34624041592426892361728] |