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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 65 |
| 3 | 4161 |
| 4 | 266305 |
| 5 | 17043521 |
| 6 | 1090785345 |
| 7 | 69810262081 |
| 8 | 4467856773185 |
| 9 | 285942833483841 |
| 10 | 18300341342965825 |
| 11 | 1171221845949812801 |
| 12 | 74958198140788019265 |
| 13 | 4797324681010433232961 |
| 14 | 307028779584667726909505 |
| 15 | 19649841893418734522208321 |
| 16 | 1257589881178799009421332545 |
[0,1,65,4161,266305,17043521,1090785345, 69810262081,4467856773185,285942833483841, 18300341342965825,1171221845949812801, 74958198140788019265,4797324681010433232961, 307028779584667726909505, 19649841893418734522208321, 1257589881178799009421332545] |