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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 20 |
| 4 | 62 |
| 5 | 132 |
| 6 | 336 |
| 7 | 688 |
| 8 | 1578 |
| 9 | 3190 |
| 10 | 6902 |
| 11 | 13878 |
| 12 | 29038 |
| 13 | 58238 |
| 14 | 119518 |
| 15 | 239390 |
| 16 | 485822 |
| 17 | 972414 |
| 18 | 1960830 |
| 19 | 3923326 |
| 20 | 7882494 |
| 21 | 15768574 |
| 22 | 31616510 |
| 23 | 63240702 |
| 24 | 126655486 |
| 25 | 253327358 |
| 26 | 507033598 |
| 27 | 1014102014 |
| 28 | 2029023230 |
| 29 | 4058120190 |
| 30 | 8118001662 |
| 31 | 16236158974 |
| 32 | 32476086270 |
[1,8,20,62,132,336,688,1578,3190,6902,13878,29038, 58238,119518,239390,485822,972414,1960830,3923326, 7882494,15768574,31616510,63240702,126655486, 253327358,507033598,1014102014,2029023230, 4058120190,8118001662,16236158974,32476086270] |