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| n | a(n) |
|---|---|
| 1 | 28 |
| 2 | 41 |
| 3 | 1158 |
| 4 | 21035 |
| 5 | 371384 |
| 6 | 6337533 |
| 7 | 113313853 |
| 8 | 2047979807 |
| 9 | 36229677541 |
| 10 | 611056441694 |
[28,41,1158,21035,371384,6337533,113313853, 2047979807,36229677541,611056441694] |