n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 14 |
4 | 40 |
5 | 115 |
6 | 331 |
7 | 953 |
8 | 2744 |
9 | 7901 |
10 | 22750 |
11 | 65506 |
12 | 188617 |
13 | 543101 |
14 | 1563797 |
15 | 4502774 |
16 | 12965221 |
17 | 37331866 |
18 | 107492824 |
19 | 309513251 |
20 | 891207887 |
21 | 2566130837 |
22 | 7388879260 |
23 | 21275429893 |
24 | 61260158842 |
25 | 176391597266 |
26 | 507899361905 |
[1,2,5,14,40,115,331,953,2744,7901,22750,65506, 188617,543101,1563797,4502774,12965221,37331866, 107492824,309513251,891207887,2566130837, 7388879260,21275429893,61260158842,176391597266, 507899361905] |