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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 27 |
| 3 | 409 |
| 4 | 9089 |
| 5 | 272947 |
| 6 | 10515147 |
| 7 | 501178937 |
| 8 | 28773452321 |
| 9 | 1949230218691 |
| 10 | 153281759047387 |
| 11 | 13806215066685433 |
| 12 | 1408621900803060705 |
| 13 | 161278353358629226675 |
| 14 | 20555596673435403499083 |
| 15 | 2896227959507289559616217 |
| 16 | 448371253145121338801335489 |
[1,3,27,409,9089,272947,10515147,501178937, 28773452321,1949230218691,153281759047387, 13806215066685433,1408621900803060705, 161278353358629226675,20555596673435403499083, 2896227959507289559616217, 448371253145121338801335489] |