n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 20 |
3 | 76 |
4 | 276 |
5 | 932 |
6 | 3944 |
7 | 15956 |
8 | 65692 |
9 | 259452 |
10 | 1035464 |
11 | 4159724 |
12 | 16638488 |
13 | 66605372 |
14 | 266499652 |
15 | 1065764840 |
[1,5,20,76,276,932,3944,15956,65692,259452, 1035464,4159724,16638488,66605372,266499652, 1065764840] |