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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 155 |
| 3 | 6156 |
| 4 | 308246 |
| 5 | 14637699 |
| 6 | 702811381 |
| 7 | 33667621356 |
| 8 | 1613595307718 |
| 9 | 77327320807492 |
| 10 | 3705787367955871 |
| 11 | 177593105803460322 |
| 12 | 8510833856676985632 |
| 13 | 407866501681469579790 |
| 14 | 19546273938797565641009 |
| 15 | 936720274971414734673655 |
[1,155,6156,308246,14637699,702811381,33667621356, 1613595307718,77327320807492,3705787367955871, 177593105803460322,8510833856676985632, 407866501681469579790,19546273938797565641009, 936720274971414734673655] |