n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 15 |
3 | 40 |
4 | 105 |
5 | 275 |
6 | 720 |
7 | 1885 |
8 | 4935 |
9 | 12920 |
10 | 33825 |
11 | 88555 |
12 | 231840 |
13 | 606965 |
14 | 1589055 |
15 | 4160200 |
16 | 10891545 |
17 | 28514435 |
18 | 74651760 |
19 | 195440845 |
20 | 511670775 |
21 | 1339571480 |
22 | 3507043665 |
23 | 9181559515 |
24 | 24037634880 |
25 | 62931345125 |
[1,5,15,40,105,275,720,1885,4935,12920,33825, 88555,231840,606965,1589055,4160200,10891545, 28514435,74651760,195440845,511670775,1339571480, 3507043665,9181559515,24037634880,62931345125] |