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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 12 |
| 5 | 77 |
| 6 | 434 |
| 7 | 1978 |
| 8 | 8830 |
| 9 | 37409 |
| 10 | 156474 |
| 11 | 644305 |
| 12 | 2632506 |
| 13 | 10684360 |
| 14 | 43166246 |
| 15 | 173768764 |
| 16 | 697596990 |
| 17 | 2794438513 |
| 18 | 11174809302 |
| 19 | 44626341136 |
| 20 | 178018744896 |
| 21 | 709505830530 |
| 22 | 2825762505810 |
| 23 | 11247704919634 |
| 24 | 44749537493028 |
| 25 | 177970696795672 |
| 26 | 707580176408854 |
| 27 | 2812524327414647 |
[1,12,77,434,1978,8830,37409,156474,644305, 2632506,10684360,43166246,173768764,697596990, 2794438513,11174809302,44626341136,178018744896, 709505830530,2825762505810,11247704919634, 44749537493028,177970696795672,707580176408854, 2812524327414647] |