| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 20 |
| 5 | 41 |
| 6 | 84 |
| 7 | 169 |
| 8 | 340 |
| 9 | 681 |
| 10 | 1364 |
| 11 | 2729 |
| 12 | 5460 |
| 13 | 10921 |
| 14 | 21844 |
| 15 | 43689 |
| 16 | 87380 |
| 17 | 174761 |
| 18 | 349524 |
| 19 | 699049 |
| 20 | 1398100 |
| 21 | 2796201 |
| 22 | 5592404 |
| 23 | 11184809 |
| 24 | 22369620 |
| 25 | 44739241 |
| 26 | 89478484 |
| 27 | 178956969 |
| 28 | 357913940 |
| 29 | 715827881 |
| 30 | 1431655764 |
| 31 | 2863311529 |
| 32 | 5726623060 |
| 33 | 11453246121 |
[0,1,4,9,20,41,84,169,340,681,1364,2729,5460, 10921,21844,43689,87380,174761,349524,699049, 1398100,2796201,5592404,11184809,22369620, 44739241,89478484,178956969,357913940,715827881, 1431655764,2863311529,5726623060,11453246121] |