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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 51 |
| 3 | 1599 |
| 4 | 74545 |
| 5 | 4654255 |
| 6 | 365549495 |
| 7 | 34642467783 |
| 8 | 3846064986001 |
| 9 | 489429448820811 |
| 10 | 70208261310969435 |
| 11 | 11205444535728231855 |
| 12 | 1969021774778391995761 |
| 13 | 377672618542009829524551 |
| 14 | 78507169034687468202172591 |
[1,3,51,1599,74545,4654255,365549495,34642467783, 3846064986001,489429448820811,70208261310969435, 11205444535728231855,1969021774778391995761, 377672618542009829524551, 78507169034687468202172591] |