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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 43 |
| 4 | 268 |
| 5 | 1740 |
| 6 | 11862 |
| 7 | 85013 |
| 8 | 639760 |
| 9 | 5045610 |
| 10 | 41615165 |
| 11 | 358185399 |
| 12 | 3210667490 |
| 13 | 29914284833 |
| 14 | 289187621900 |
| 15 | 2895861006415 |
[1,7,43,268,1740,11862,85013,639760,5045610, 41615165,358185399,3210667490,29914284833, 289187621900,2895861006415] |