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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 2 |
| 8 | 16 |
| 9 | 93 |
| 10 | 505 |
| 11 | 2548 |
| 12 | 12400 |
| 13 | 58140 |
| 14 | 266550 |
| 15 | 1198564 |
| 16 | 5312032 |
| 17 | 23263695 |
| 18 | 100910001 |
| 19 | 434217000 |
| 20 | 1855972096 |
| 21 | 7887862224 |
| 22 | 33359979546 |
| 23 | 140492933100 |
| 24 | 589495272736 |
| 25 | 2465455090098 |
| 26 | 10281760786682 |
| 27 | 42768958597992 |
| 28 | 177499631598976 |
| 29 | 735146520745000 |
| 30 | 3039095720959424 |
| 31 | 12542491305496152 |
[1,2,16,93,505,2548,12400,58140,266550,1198564, 5312032,23263695,100910001,434217000,1855972096, 7887862224,33359979546,140492933100,589495272736, 2465455090098,10281760786682,42768958597992, 177499631598976,735146520745000,3039095720959424, 12542491305496152] |