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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 34 |
| 3 | 274 |
| 4 | 2276 |
| 5 | 8126 |
| 6 | 184876 |
| 7 | 446876 |
| 8 | 18671876 |
| 9 | 95234374 |
| 10 | 1144976876 |
| 11 | 6018359374 |
| 12 | 281025390626 |
| 13 | 2068291015624 |
| 14 | 6254345703124 |
| 15 | 181171630859374 |
| 16 | 337813720703126 |
| 17 | 31079046044921876 |
| 18 | 205337027587890626 |
[4,34,274,2276,8126,184876,446876,18671876, 95234374,1144976876,6018359374,281025390626, 2068291015624,6254345703124,181171630859374, 337813720703126,31079046044921876, 205337027587890626] |