n | a(n) |
---|---|
2 | 0 |
3 | 0 |
4 | 1 |
5 | 6 |
6 | 25 |
7 | 105 |
8 | 490 |
9 | 2548 |
10 | 14698 |
11 | 93420 |
12 | 649715 |
13 | 4912776 |
14 | 40154387 |
15 | 352937312 |
16 | 3320636540 |
17 | 33305992320 |
18 | 354819046132 |
19 | 4001699525376 |
20 | 47637151241125 |
21 | 596958623741440 |
22 | 7855611484697773 |
23 | 108314507544748032 |
24 | 1561635447992241230 |
25 | 23498865431367684096 |
[0,0,1,6,25,105,490,2548,14698,93420,649715, 4912776,40154387,352937312,3320636540,33305992320, 354819046132,4001699525376,47637151241125, 596958623741440,7855611484697773, 108314507544748032,1561635447992241230, 23498865431367684096] |