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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 38 |
| 4 | 256 |
| 5 | 1805 |
| 6 | 13162 |
| 7 | 98469 |
| 8 | 751656 |
| 9 | 5831451 |
| 10 | 45847770 |
| 11 | 364498596 |
| 12 | 2925337352 |
| 13 | 23668977163 |
| 14 | 192859753310 |
| 15 | 1581188102590 |
| 16 | 13034447714688 |
| 17 | 107971181472779 |
| 18 | 898274382703314 |
| 19 | 7502546644142842 |
| 20 | 62884859093960160 |
| 21 | 528788663216036559 |
| 22 | 4459599092506030110 |
[1,6,38,256,1805,13162,98469,751656,5831451, 45847770,364498596,2925337352,23668977163, 192859753310,1581188102590,13034447714688, 107971181472779,898274382703314,7502546644142842, 62884859093960160,528788663216036559, 4459599092506030110] |