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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 6 |
| 4 | 12 |
| 5 | 28 |
| 6 | 56 |
| 7 | 116 |
| 8 | 244 |
| 9 | 488 |
| 10 | 984 |
| 11 | 2008 |
| 12 | 4016 |
| 13 | 8048 |
| 14 | 16240 |
| 15 | 32480 |
| 16 | 64968 |
| 17 | 129992 |
| 18 | 261064 |
| 19 | 522128 |
| 20 | 1044264 |
| 21 | 2088552 |
| 22 | 4177512 |
| 23 | 8371816 |
| 24 | 16743632 |
| 25 | 33487312 |
| 26 | 66976208 |
| 27 | 134085072 |
| 28 | 268170144 |
| 29 | 536340304 |
| 30 | 1072680624 |
| 31 | 2145361584 |
[0,2,6,12,28,56,116,244,488,984,2008,4016,8048, 16240,32480,64968,129992,261064,522128,1044264, 2088552,4177512,8371816,16743632,33487312, 66976208,134085072,268170144,536340304,1072680624, 2145361584] |