n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 52 |
6 | 203 |
7 | 877 |
8 | 3263 |
9 | 11155 |
10 | 36810 |
11 | 120635 |
12 | 398736 |
13 | 1340561 |
14 | 4605989 |
15 | 15908448 |
16 | 54826671 |
17 | 188085307 |
18 | 642431001 |
19 | 2188102307 |
20 | 7446095610 |
21 | 25366540627 |
22 | 86531467800 |
23 | 295449388797 |
24 | 1009134603216 |
25 | 3446558809107 |
26 | 11767813404774 |
27 | 40167156826109 |
[1,1,2,5,15,52,203,877,3263,11155,36810,120635, 398736,1340561,4605989,15908448,54826671, 188085307,642431001,2188102307,7446095610, 25366540627,86531467800,295449388797, 1009134603216,3446558809107,11767813404774, 40167156826109] |