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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 617 |
| 3 | 10079 |
| 4 | 147609 |
| 5 | 2022447 |
| 6 | 26547529 |
| 7 | 338695423 |
| 8 | 4238709497 |
| 9 | 52353238223 |
| 10 | 640806363561 |
| 11 | 7794824571807 |
| 12 | 94411354501465 |
| 13 | 1140149916014959 |
| 14 | 13741090450747913 |
| 15 | 165378493289389631 |
[1,31,617,10079,147609,2022447,26547529,338695423, 4238709497,52353238223,640806363561,7794824571807, 94411354501465,1140149916014959,13741090450747913, 165378493289389631] |