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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 23 |
| 3 | 139 |
| 4 | 1831 |
| 5 | 30593 |
| 6 | 162143 |
| 7 | 1100977 |
| 8 | 10343761 |
| 9 | 147684137 |
| 10 | 1202442089 |
| 11 | 12109172293 |
| 12 | 156798792223 |
| 13 | 1051602787181 |
| 14 | 20761252261751 |
| 15 | 110526670235599 |
| 16 | 1271309838631957 |
[2,23,139,1831,30593,162143,1100977,10343761, 147684137,1202442089,12109172293,156798792223, 1051602787181,20761252261751,110526670235599, 1271309838631957] |