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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 0 |
| 3 | 3 |
| 4 | 2 |
| 5 | 7 |
| 6 | 10 |
| 7 | 23 |
| 8 | 42 |
| 9 | 87 |
| 10 | 170 |
| 11 | 343 |
| 12 | 682 |
| 13 | 1367 |
| 14 | 2730 |
| 15 | 5463 |
| 16 | 10922 |
| 17 | 21847 |
| 18 | 43690 |
| 19 | 87383 |
| 20 | 174762 |
| 21 | 349527 |
| 22 | 699050 |
| 23 | 1398103 |
| 24 | 2796202 |
| 25 | 5592407 |
| 26 | 11184810 |
| 27 | 22369623 |
| 28 | 44739242 |
| 29 | 89478487 |
| 30 | 178956970 |
| 31 | 357913943 |
| 32 | 715827882 |
| 33 | 1431655767 |
| 34 | 2863311530 |
| 35 | 5726623063 |
| 36 | 11453246122 |
| 37 | 22906492247 |
| 38 | 45812984490 |
[0,2,0,3,2,7,10,23,42,87,170,343,682,1367,2730, 5463,10922,21847,43690,87383,174762,349527,699050, 1398103,2796202,5592407,11184810,22369623, 44739242,89478487,178956970,357913943,715827882, 1431655767,2863311530,5726623063,11453246122, 22906492247,45812984490] |