n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 12 |
4 | 44 |
5 | 168 |
6 | 690 |
7 | 2854 |
8 | 12137 |
9 | 52565 |
10 | 230978 |
11 | 1027736 |
12 | 4618934 |
13 | 20940759 |
14 | 95652631 |
15 | 439609712 |
16 | 2032093808 |
17 | 9437604683 |
18 | 44029824803 |
19 | 206186450321 |
20 | 969017501835 |
21 | 4568147835026 |
22 | 21597469460174 |
23 | 102372497782333 |
24 | 486400762196343 |
25 | 2316061651796092 |
26 | 11050201383338180 |
27 | 52819654295561794 |
[1,1,4,12,44,168,690,2854,12137,52565,230978, 1027736,4618934,20940759,95652631,439609712, 2032093808,9437604683,44029824803,206186450321, 969017501835,4568147835026,21597469460174, 102372497782333,486400762196343,2316061651796092, 11050201383338180,52819654295561794] |