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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 13 |
| 9 | 102 |
| 10 | 629 |
| 11 | 3366 |
| 12 | 16422 |
| 13 | 75140 |
| 14 | 328185 |
| 15 | 1384345 |
| 16 | 5685306 |
| 17 | 22863861 |
| 18 | 90420110 |
| 19 | 352754930 |
| 20 | 1360882980 |
| 21 | 5201391077 |
| 22 | 19724548877 |
| 23 | 74300429926 |
| 24 | 278279597781 |
| 25 | 1037075511926 |
| 26 | 3848154018734 |
| 27 | 14224439297732 |
| 28 | 52402156308977 |
| 29 | 192466640908913 |
| 30 | 705003243252722 |
[1,13,102,629,3366,16422,75140,328185,1384345, 5685306,22863861,90420110,352754930,1360882980, 5201391077,19724548877,74300429926,278279597781, 1037075511926,3848154018734,14224439297732, 52402156308977,192466640908913,705003243252722] |