n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 7 |
4 | 25 |
5 | 91 |
6 | 336 |
7 | 1254 |
8 | 4719 |
9 | 17875 |
10 | 68068 |
11 | 260338 |
12 | 999362 |
13 | 3848222 |
14 | 14858000 |
15 | 57500460 |
16 | 222981435 |
17 | 866262915 |
18 | 3370764540 |
19 | 13135064250 |
20 | 51250632510 |
21 | 200205672810 |
22 | 782920544640 |
23 | 3064665881940 |
24 | 12007086477750 |
25 | 47081501377326 |
26 | 184753963255176 |
27 | 725510446350004 |
[1,2,7,25,91,336,1254,4719,17875,68068,260338, 999362,3848222,14858000,57500460,222981435, 866262915,3370764540,13135064250,51250632510, 200205672810,782920544640,3064665881940, 12007086477750,47081501377326,184753963255176, 725510446350004] |