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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 8 |
| 3 | 17 |
| 4 | 32 |
| 5 | 57 |
| 6 | 100 |
| 7 | 177 |
| 8 | 320 |
| 9 | 593 |
| 10 | 1124 |
| 11 | 2169 |
| 12 | 4240 |
| 13 | 8361 |
| 14 | 16580 |
| 15 | 32993 |
| 16 | 65792 |
| 17 | 131361 |
| 18 | 262468 |
| 19 | 524649 |
| 20 | 1048976 |
| 21 | 2097593 |
| 22 | 4194788 |
| 23 | 8389137 |
| 24 | 16777792 |
| 25 | 33555057 |
| 26 | 67109540 |
| 27 | 134218457 |
| 28 | 268436240 |
[1,3,8,17,32,57,100,177,320,593,1124,2169,4240, 8361,16580,32993,65792,131361,262468,524649, 1048976,2097593,4194788,8389137,16777792,33555057, 67109540,134218457,268436240] |