n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 30 |
3 | 155 |
4 | 855 |
5 | 4305 |
6 | 23255 |
7 | 116705 |
8 | 614655 |
9 | 3108355 |
10 | 16168430 |
11 | 81136755 |
12 | 422279580 |
13 | 2116775030 |
14 | 10893334980 |
15 | 54857686305 |
16 | 281413208380 |
17 | 1410806289330 |
18 | 7237582729155 |
19 | 36262232611605 |
20 | 185184341144805 |
[1,5,30,155,855,4305,23255,116705,614655,3108355, 16168430,81136755,422279580,2116775030, 10893334980,54857686305,281413208380, 1410806289330,7237582729155,36262232611605, 185184341144805] |