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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 17 |
| 6 | 41 |
| 7 | 88 |
| 8 | 190 |
| 9 | 421 |
| 10 | 935 |
| 11 | 2051 |
| 12 | 4445 |
| 13 | 9562 |
| 14 | 20476 |
| 15 | 43681 |
| 16 | 92837 |
| 17 | 196613 |
| 18 | 415073 |
| 19 | 873820 |
| 20 | 1835002 |
| 21 | 3844765 |
| 22 | 8039075 |
| 23 | 16777223 |
| 24 | 34952549 |
| 25 | 72701278 |
| 26 | 150994936 |
| 27 | 313174681 |
| 28 | 648719009 |
| 29 | 1342177289 |
| 30 | 2773833065 |
| 31 | 5726623072 |
[1,1,1,5,17,41,88,190,421,935,2051,4445,9562, 20476,43681,92837,196613,415073,873820,1835002, 3844765,8039075,16777223,34952549,72701278, 150994936,313174681,648719009,1342177289, 2773833065,5726623072] |