n | a(n) |
---|---|
6 | 2 |
7 | 20 |
8 | 150 |
9 | 1040 |
10 | 7105 |
11 | 49112 |
12 | 347760 |
13 | 2537640 |
14 | 19135875 |
15 | 149285400 |
16 | 1205088742 |
17 | 10062575068 |
18 | 86859191510 |
19 | 774456785200 |
20 | 7126496659960 |
21 | 67617733760064 |
22 | 660932425168071 |
23 | 6649326113764980 |
24 | 68793130453044760 |
25 | 731299516881396540 |
[2,20,150,1040,7105,49112,347760,2537640,19135875, 149285400,1205088742,10062575068,86859191510, 774456785200,7126496659960,67617733760064, 660932425168071,6649326113764980, 68793130453044760,731299516881396540] |