n | a(n) |
---|---|
1 | 1 |
2 | 10 |
3 | 50 |
4 | 252 |
5 | 754 |
6 | 3500 |
7 | 8450 |
8 | 34680 |
9 | 89635 |
10 | 309140 |
11 | 700402 |
12 | 2910600 |
13 | 5688370 |
14 | 20195500 |
15 | 50706500 |
16 | 160553712 |
17 | 329639810 |
18 | 1248615550 |
19 | 2398289458 |
20 | 8732957688 |
21 | 19306982500 |
22 | 56865638380 |
23 | 119281100930 |
24 | 461838762000 |
25 | 853941516771 |
[1,10,50,252,754,3500,8450,34680,89635,309140, 700402,2910600,5688370,20195500,50706500, 160553712,329639810,1248615550,2398289458, 8732957688,19306982500,56865638380,119281100930, 461838762000,853941516771] |