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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 31 |
| 6 | 100 |
| 7 | 336 |
| 8 | 1164 |
| 9 | 4208 |
| 10 | 15469 |
| 11 | 58466 |
| 12 | 225190 |
| 13 | 880301 |
| 14 | 3496564 |
| 15 | 14038923 |
| 16 | 56997583 |
| 17 | 233660341 |
| 18 | 965627303 |
| 19 | 4022453551 |
| 20 | 16868310880 |
| 21 | 71177273008 |
| 22 | 302067154265 |
| 23 | 1288436846350 |
| 24 | 5522066045103 |
| 25 | 23769932778195 |
| 26 | 102728465777956 |
| 27 | 445638762353076 |
| 28 | 1939857841809377 |
| 29 | 8471446919675513 |
[1,1,2,4,11,31,100,336,1164,4208,15469,58466, 225190,880301,3496564,14038923,56997583,233660341, 965627303,4022453551,16868310880,71177273008, 302067154265,1288436846350,5522066045103, 23769932778195,102728465777956,445638762353076, 1939857841809377,8471446919675513] |