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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 29 |
| 3 | 150 |
| 4 | 742 |
| 5 | 3744 |
| 6 | 18840 |
| 7 | 94891 |
| 8 | 477850 |
| 9 | 2406649 |
| 10 | 12120617 |
| 11 | 61043229 |
| 12 | 307433020 |
| 13 | 1548331209 |
| 14 | 7797889752 |
| 15 | 39272660089 |
| 16 | 197789648884 |
| 17 | 996131790595 |
| 18 | 5016837561113 |
| 19 | 25266394843590 |
| 20 | 127249627060291 |
| 21 | 640869727748787 |
[7,29,150,742,3744,18840,94891,477850,2406649, 12120617,61043229,307433020,1548331209,7797889752, 39272660089,197789648884,996131790595, 5016837561113,25266394843590,127249627060291, 640869727748787] |