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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 37 |
| 4 | 247 |
| 5 | 2557 |
| 6 | 32587 |
| 7 | 543097 |
| 8 | 10242787 |
| 9 | 233335657 |
| 10 | 6703028887 |
| 11 | 207263519017 |
| 12 | 7628001653827 |
| 13 | 311878265181037 |
| 14 | 13394639596851067 |
| 15 | 628284422185342477 |
| 16 | 33217442899375387207 |
| 17 | 1955977793053588026277 |
| 18 | 119244359152460559009547 |
[1,7,37,247,2557,32587,543097,10242787,233335657, 6703028887,207263519017,7628001653827, 311878265181037,13394639596851067, 628284422185342477,33217442899375387207, 1955977793053588026277,119244359152460559009547] |