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| n | a(n) |
|---|---|
| 1 | 391 |
| 2 | 2804 |
| 3 | 20684 |
| 4 | 161571 |
| 5 | 1252304 |
| 6 | 9823368 |
| 7 | 76931991 |
| 8 | 603313744 |
| 9 | 4730797071 |
| 10 | 37100667206 |
| 11 | 290947460647 |
| 12 | 2281693532812 |
| 13 | 17893663414565 |
| 14 | 140326848073352 |
| 15 | 1100482594455998 |
| 16 | 8630285459242719 |
| 17 | 67681077927288230 |
| 18 | 530773701234315911 |
[391,2804,20684,161571,1252304,9823368,76931991, 603313744,4730797071,37100667206,290947460647, 2281693532812,17893663414565,140326848073352, 1100482594455998,8630285459242719, 67681077927288230,530773701234315911] |