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| n | a(n) |
|---|---|
| 1 | 1824 |
| 2 | 5612 |
| 3 | 17448 |
| 4 | 56936 |
| 5 | 188040 |
| 6 | 648536 |
| 7 | 2264904 |
| 8 | 8215256 |
| 9 | 30142344 |
| 10 | 114224792 |
| 11 | 436849608 |
| 12 | 1716521816 |
| 13 | 6787144200 |
| 14 | 27449810456 |
| 15 | 111385692744 |
| 16 | 460731399896 |
| 17 | 1906999712904 |
| 18 | 8026422662552 |
| 19 | 33728591085768 |
| 20 | 143889611473496 |
[1824,5612,17448,56936,188040,648536,2264904, 8215256,30142344,114224792,436849608,1716521816, 6787144200,27449810456,111385692744,460731399896, 1906999712904,8026422662552,33728591085768, 143889611473496] |