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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 29 |
| 6 | 88 |
| 7 | 287 |
| 8 | 959 |
| 9 | 3339 |
| 10 | 11879 |
| 11 | 43425 |
| 12 | 161638 |
| 13 | 612803 |
| 14 | 2358591 |
| 15 | 9197282 |
| 16 | 36298599 |
| 17 | 144732075 |
| 18 | 582562293 |
| 19 | 2364494107 |
| 20 | 9670613493 |
| 21 | 39824362354 |
| 22 | 165041369538 |
| 23 | 687914981583 |
| 24 | 2882579631664 |
| 25 | 12138167876153 |
| 26 | 51343558159145 |
| 27 | 218092918948182 |
| 28 | 930013276848835 |
| 29 | 3980284917713303 |
[1,1,2,4,10,29,88,287,959,3339,11879,43425,161638, 612803,2358591,9197282,36298599,144732075, 582562293,2364494107,9670613493,39824362354, 165041369538,687914981583,2882579631664, 12138167876153,51343558159145,218092918948182, 930013276848835,3980284917713303] |