n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 7 |
4 | 30 |
5 | 75 |
6 | 293 |
7 | 897 |
8 | 3296 |
9 | 11493 |
10 | 41905 |
11 | 153503 |
12 | 570138 |
13 | 2136265 |
14 | 8128562 |
15 | 30938365 |
16 | 119262756 |
17 | 461558439 |
18 | 1797401295 |
19 | 7047184967 |
20 | 27701702878 |
21 | 109512364145 |
22 | 434806576518 |
23 | 1730879700961 |
24 | 6923437993554 |
25 | 27750890786575 |
26 | 111617155390501 |
27 | 450364141890515 |
28 | 1820424319409176 |
[1,1,4,7,30,75,293,897,3296,11493,41905,153503, 570138,2136265,8128562,30938365,119262756, 461558439,1797401295,7047184967,27701702878, 109512364145,434806576518,1730879700961, 6923437993554,27750890786575,111617155390501, 450364141890515,1820424319409176] |