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| n | a(n) |
|---|---|
| 1 | 138 |
| 2 | 19044 |
| 3 | 252544 |
| 4 | 41164952 |
| 5 | 3815358480 |
| 6 | 386807892609 |
| 7 | 49198404222036 |
| 8 | 6403019500770522 |
[138,19044,252544,41164952,3815358480, 386807892609,49198404222036,6403019500770522] |