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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 6 |
| 5 | 14 |
| 6 | 28 |
| 7 | 58 |
| 8 | 94 |
| 9 | 158 |
| 10 | 268 |
| 11 | 538 |
| 12 | 790 |
| 13 | 1582 |
| 14 | 2590 |
| 15 | 4030 |
| 16 | 5374 |
| 17 | 10750 |
| 18 | 14686 |
| 19 | 29374 |
| 20 | 41038 |
| 21 | 60798 |
| 22 | 95998 |
| 23 | 191998 |
| 24 | 242878 |
| 25 | 340030 |
| 26 | 532222 |
| 27 | 677374 |
| 28 | 917278 |
| 29 | 1834558 |
| 30 | 2332798 |
| 31 | 4665598 |
| 32 | 5529598 |
| 33 | 7864318 |
| 34 | 12165118 |
| 35 | 16422910 |
| 36 | 19595518 |
| 37 | 39191038 |
| 38 | 60466174 |
[0,0,0,2,6,14,28,58,94,158,268,538,790,1582,2590, 4030,5374,10750,14686,29374,41038,60798,95998, 191998,242878,340030,532222,677374,917278,1834558, 2332798,4665598,5529598,7864318,12165118,16422910, 19595518,39191038,60466174] |