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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 41 |
| 3 | 196 |
| 4 | 751 |
| 5 | 5570 |
| 6 | 33158 |
| 7 | 178469 |
| 8 | 1051514 |
| 9 | 6152761 |
| 10 | 35360059 |
| 11 | 204610794 |
| 12 | 1185387515 |
| 13 | 6858428469 |
| 14 | 39687403360 |
| 15 | 229672443463 |
| 16 | 1329125857816 |
| 17 | 7691795163442 |
| 18 | 44512304299166 |
| 19 | 257592990212772 |
| 20 | 1490702456602803 |
[1,41,196,751,5570,33158,178469,1051514,6152761, 35360059,204610794,1185387515,6858428469, 39687403360,229672443463,1329125857816, 7691795163442,44512304299166,257592990212772, 1490702456602803] |