n | a(n) |
---|---|
1 | 0 |
2 | 3 |
3 | 3 |
4 | 10 |
5 | 32 |
6 | 120 |
7 | 471 |
8 | 2070 |
9 | 9055 |
10 | 39809 |
11 | 178728 |
12 | 805614 |
13 | 3628936 |
14 | 16427863 |
15 | 74247523 |
16 | 336094409 |
17 | 1520856812 |
18 | 6885288837 |
19 | 31164948670 |
20 | 141091227797 |
21 | 638704784849 |
22 | 2891500909471 |
23 | 13090012145416 |
24 | 59260093885255 |
[0,3,3,10,32,120,471,2070,9055,39809,178728, 805614,3628936,16427863,74247523,336094409, 1520856812,6885288837,31164948670,141091227797, 638704784849,2891500909471,13090012145416, 59260093885255] |