| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 42 |
| 6 | 132 |
| 7 | 427 |
| 8 | 1461 |
| 9 | 5149 |
| 10 | 18208 |
| 11 | 66167 |
| 12 | 245809 |
| 13 | 916554 |
| 14 | 3472325 |
| 15 | 13336423 |
| 16 | 51381259 |
| 17 | 200314770 |
| 18 | 788549887 |
| 19 | 3109894305 |
| 20 | 12375535543 |
| 21 | 49619709706 |
| 22 | 199200086118 |
| 23 | 805276630442 |
| 24 | 3274867775817 |
| 25 | 13330519836543 |
| 26 | 54567851023957 |
| 27 | 224455435083738 |
| 28 | 923884816807443 |
| 29 | 3820535590726406 |
[1,1,2,5,14,42,132,427,1461,5149,18208,66167, 245809,916554,3472325,13336423,51381259,200314770, 788549887,3109894305,12375535543,49619709706, 199200086118,805276630442,3274867775817, 13330519836543,54567851023957,224455435083738, 923884816807443,3820535590726406] |