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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 21 |
| 3 | 95 |
| 4 | 340 |
| 5 | 1758 |
| 6 | 13031 |
| 7 | 87730 |
| 8 | 569770 |
| 9 | 4036330 |
| 10 | 30394943 |
| 11 | 222697188 |
| 12 | 1602691484 |
| 13 | 11764661177 |
| 14 | 87557106997 |
| 15 | 645627405743 |
| 16 | 4729643084580 |
| 17 | 34840151966126 |
| 18 | 257693611496166 |
| 19 | 1900371011202758 |
| 20 | 13983289362523029 |
[16,21,95,340,1758,13031,87730,569770,4036330, 30394943,222697188,1602691484,11764661177, 87557106997,645627405743,4729643084580, 34840151966126,257693611496166,1900371011202758, 13983289362523029] |