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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 15 |
| 3 | 276 |
| 4 | 5534533 |
| 5 | 1473914807822315239 |
| 6 | 28960574959925842749932484608400325311784104 |
| 7 | 11182854043812984653151849586832952714557996202582672732591909323787317314909793862964567968430394 |
[4,15,276,5534533,1473914807822315239, 28960574959925842749932484608400325311784104, 11182854043812984653151849586832952714557996202582\ 672732591909323787317314909793862964567968430394] |