n | a(n) |
---|---|
3 | 1 |
4 | 3 |
5 | 11 |
6 | 37 |
7 | 126 |
8 | 430 |
9 | 1454 |
10 | 4976 |
11 | 16880 |
12 | 57824 |
13 | 197010 |
14 | 675428 |
15 | 2310268 |
16 | 7927778 |
17 | 27205180 |
18 | 93448486 |
19 | 321537086 |
20 | 1105589516 |
21 | 3812424912 |
22 | 13121988240 |
23 | 45330375774 |
24 | 156172996170 |
25 | 540314673678 |
26 | 1863197292582 |
27 | 6454265995454 |
28 | 22275589419432 |
29 | 77246945788890 |
30 | 266813803179348 |
[1,3,11,37,126,430,1454,4976,16880,57824,197010, 675428,2310268,7927778,27205180,93448486, 321537086,1105589516,3812424912,13121988240, 45330375774,156172996170,540314673678, 1863197292582,6454265995454,22275589419432, 77246945788890,266813803179348] |