n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 21 |
5 | 76 |
6 | 275 |
7 | 989 |
8 | 3539 |
9 | 12631 |
10 | 45066 |
11 | 161021 |
12 | 576887 |
13 | 2074166 |
14 | 7488003 |
15 | 27150233 |
16 | 98878251 |
17 | 361680595 |
18 | 1328574654 |
19 | 4900021037 |
20 | 18141052047 |
21 | 67402330234 |
22 | 251263851255 |
23 | 939561899651 |
24 | 3523414637736 |
25 | 13248113693491 |
26 | 49935804727105 |
27 | 188651583360524 |
28 | 714214447347319 |
[1,1,2,6,21,76,275,989,3539,12631,45066,161021, 576887,2074166,7488003,27150233,98878251, 361680595,1328574654,4900021037,18141052047, 67402330234,251263851255,939561899651, 3523414637736,13248113693491,49935804727105, 188651583360524,714214447347319] |