n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 26 |
4 | 260 |
5 | 3368 |
6 | 53744 |
7 | 1022320 |
8 | 22522960 |
9 | 565532992 |
10 | 15915225216 |
11 | 496911749920 |
12 | 17029582652416 |
13 | 636101065346560 |
14 | 25705530908501760 |
15 | 1118038500044633088 |
16 | 52054862490790200576 |
17 | 2584158975023147147264 |
[1,4,26,260,3368,53744,1022320,22522960,565532992, 15915225216,496911749920,17029582652416, 636101065346560,25705530908501760, 1118038500044633088,52054862490790200576, 2584158975023147147264] |