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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 9 |
| 4 | 17 |
| 5 | 125 |
| 6 | 461 |
| 7 | 1715 |
| 8 | 3217 |
| 9 | 24309 |
| 10 | 92377 |
| 11 | 352715 |
| 12 | 1352077 |
| 13 | 5200299 |
| 14 | 20058299 |
| 15 | 77558759 |
| 16 | 150270097 |
| 17 | 1166803109 |
| 18 | 4537567649 |
| 19 | 17672631899 |
| 20 | 68923264409 |
| 21 | 269128937219 |
| 22 | 1052049481859 |
| 23 | 4116715363799 |
| 24 | 16123801841549 |
| 25 | 63205303218875 |
| 26 | 247959266474051 |
| 27 | 973469712824055 |
| 28 | 3824345300380219 |
| 29 | 15033633249770519 |
[0,1,9,17,125,461,1715,3217,24309,92377,352715, 1352077,5200299,20058299,77558759,150270097, 1166803109,4537567649,17672631899,68923264409, 269128937219,1052049481859,4116715363799, 16123801841549,63205303218875,247959266474051, 973469712824055,3824345300380219, 15033633249770519] |