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| n | a(n) |
|---|---|
| 1 | 3871 |
| 2 | 13555 |
| 3 | 44641 |
| 4 | 180069 |
| 5 | 688431 |
| 6 | 2831919 |
| 7 | 11333145 |
| 8 | 46809649 |
| 9 | 190964841 |
| 10 | 791496341 |
| 11 | 3264483283 |
| 12 | 13586735979 |
| 13 | 56476461657 |
| 14 | 236142767631 |
| 15 | 987919418993 |
| 16 | 4150817865787 |
| 17 | 17465593473337 |
| 18 | 73745244701555 |
| 19 | 311975289448169 |
[3871,13555,44641,180069,688431,2831919,11333145, 46809649,190964841,791496341,3264483283, 13586735979,56476461657,236142767631,987919418993, 4150817865787,17465593473337,73745244701555, 311975289448169] |