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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 95 |
| 3 | 727 |
| 4 | 5410 |
| 5 | 34959 |
| 6 | 214767 |
| 7 | 1272216 |
| 8 | 7244186 |
| 9 | 39698797 |
| 10 | 209815077 |
| 11 | 1070798249 |
| 12 | 5281686410 |
| 13 | 25200974573 |
| 14 | 116438844036 |
[21,95,727,5410,34959,214767,1272216,7244186, 39698797,209815077,1070798249,5281686410, 25200974573,116438844036] |