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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 46 |
| 3 | 376 |
| 4 | 3181 |
| 5 | 27492 |
| 6 | 241088 |
| 7 | 2136704 |
| 8 | 19090180 |
| 9 | 171642566 |
| 10 | 1551167806 |
| 11 | 14077358512 |
| 12 | 128208471574 |
| 13 | 1171160277832 |
| 14 | 10726023380836 |
| 15 | 98455061321728 |
| 16 | 905513833456684 |
| 17 | 8342789125417080 |
| 18 | 76984637089505752 |
| 19 | 711383432273465496 |
| 20 | 6581893062809397533 |
[1,6,46,376,3181,27492,241088,2136704,19090180, 171642566,1551167806,14077358512,128208471574, 1171160277832,10726023380836,98455061321728, 905513833456684,8342789125417080, 76984637089505752,711383432273465496, 6581893062809397533] |