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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 36 |
| 3 | 173 |
| 4 | 1017 |
| 5 | 5965 |
| 6 | 34865 |
| 7 | 203933 |
| 8 | 1192701 |
| 9 | 6974781 |
| 10 | 40786925 |
| 11 | 238509373 |
| 12 | 1394719389 |
| 13 | 8155807421 |
| 14 | 47692103389 |
| 15 | 278885349565 |
| 16 | 1630815353885 |
| 17 | 9536385985277 |
| 18 | 55765143107101 |
| 19 | 326093248975229 |
| 20 | 1906868691945053 |
[4,36,173,1017,5965,34865,203933,1192701,6974781, 40786925,238509373,1394719389,8155807421, 47692103389,278885349565,1630815353885, 9536385985277,55765143107101,326093248975229, 1906868691945053] |