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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 8 |
| 5 | 18 |
| 6 | 34 |
| 7 | 70 |
| 8 | 134 |
| 9 | 270 |
| 10 | 526 |
| 11 | 1054 |
| 12 | 2078 |
| 13 | 4158 |
| 14 | 8254 |
| 15 | 16510 |
| 16 | 32894 |
| 17 | 65790 |
| 18 | 131326 |
| 19 | 262654 |
| 20 | 524798 |
| 21 | 1049598 |
| 22 | 2098174 |
| 23 | 4196350 |
| 24 | 8390654 |
| 25 | 16781310 |
| 26 | 33558526 |
| 27 | 67117054 |
| 28 | 134225918 |
| 29 | 268451838 |
| 30 | 536887294 |
| 31 | 1073774590 |
| 32 | 2147516414 |
| 33 | 4295032830 |
| 34 | 8590000126 |
[0,1,4,8,18,34,70,134,270,526,1054,2078,4158,8254, 16510,32894,65790,131326,262654,524798,1049598, 2098174,4196350,8390654,16781310,33558526, 67117054,134225918,268451838,536887294,1073774590, 2147516414,4295032830,8590000126] |