n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 25 |
3 | 100 |
4 | 370 |
5 | 1251 |
6 | 4005 |
7 | 12150 |
8 | 35400 |
9 | 99365 |
10 | 270353 |
11 | 715025 |
12 | 1844650 |
13 | 4652075 |
14 | 11494605 |
15 | 27872056 |
16 | 66428295 |
17 | 155809600 |
18 | 360079225 |
19 | 820715820 |
20 | 1846583863 |
21 | 4104572975 |
22 | 9019869125 |
23 | 19608423750 |
24 | 42193733645 |
25 | 89917531549 |
26 | 189863358445 |
27 | 397401303850 |
[1,5,25,100,370,1251,4005,12150,35400,99365, 270353,715025,1844650,4652075,11494605,27872056, 66428295,155809600,360079225,820715820,1846583863, 4104572975,9019869125,19608423750,42193733645, 89917531549,189863358445,397401303850] |