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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 38 |
| 3 | 152 |
| 4 | 928 |
| 5 | 4920 |
| 6 | 27508 |
| 7 | 152358 |
| 8 | 852940 |
| 9 | 4796962 |
| 10 | 27117826 |
| 11 | 153988846 |
| 12 | 877458110 |
| 13 | 5015185460 |
| 14 | 28736333450 |
| 15 | 165022598514 |
| 16 | 949503677434 |
| 17 | 5472715411708 |
| 18 | 31592116727316 |
| 19 | 182623690514234 |
| 20 | 1057008913476932 |
[6,38,152,928,4920,27508,152358,852940,4796962, 27117826,153988846,877458110,5015185460, 28736333450,165022598514,949503677434, 5472715411708,31592116727316,182623690514234, 1057008913476932] |