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| n | a(n) |
|---|---|
| 4 | 9 |
| 5 | 18 |
| 6 | 35 |
| 7 | 82 |
| 8 | 180 |
| 9 | 385 |
| 10 | 846 |
| 11 | 1853 |
| 12 | 4034 |
| 13 | 8810 |
| 14 | 19249 |
| 15 | 42014 |
| 16 | 91727 |
| 17 | 200298 |
| 18 | 437316 |
| 19 | 954809 |
| 20 | 2084746 |
| 21 | 4551801 |
| 22 | 9938290 |
| 23 | 21699138 |
| 24 | 47377577 |
| 25 | 103443386 |
| 26 | 225856667 |
| 27 | 493131922 |
| 28 | 1076696324 |
| 29 | 2350841633 |
| 30 | 5132790390 |
| 31 | 11206852917 |
| 32 | 24468864530 |
[9,18,35,82,180,385,846,1853,4034,8810,19249, 42014,91727,200298,437316,954809,2084746,4551801, 9938290,21699138,47377577,103443386,225856667, 493131922,1076696324,2350841633,5132790390, 11206852917,24468864530] |