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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 63 |
| 3 | 806 |
| 4 | 11445 |
| 5 | 173388 |
| 6 | 2745470 |
| 7 | 44891118 |
| 8 | 752141682 |
| 9 | 12845874594 |
| 10 | 222813745704 |
| 11 | 3914269052736 |
| 12 | 69501455945987 |
| 13 | 1245309605501088 |
| 14 | 22488056019050124 |
| 15 | 408861223600687710 |
| 16 | 7478056231521533658 |
| 17 | 137496627558561863460 |
| 18 | 2540015518588821201453 |
[1,6,63,806,11445,173388,2745470,44891118, 752141682,12845874594,222813745704,3914269052736, 69501455945987,1245309605501088,22488056019050124, 408861223600687710,7478056231521533658, 137496627558561863460,2540015518588821201453] |