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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 13 |
| 6 | 30 |
| 7 | 64 |
| 8 | 137 |
| 9 | 286 |
| 10 | 594 |
| 11 | 1221 |
| 12 | 2498 |
| 13 | 5084 |
| 14 | 10313 |
| 15 | 20858 |
| 16 | 42094 |
| 17 | 84797 |
| 18 | 170582 |
| 19 | 342760 |
| 20 | 688105 |
| 21 | 1380390 |
| 22 | 2767546 |
| 23 | 5546037 |
| 24 | 11109786 |
| 25 | 22248228 |
| 26 | 44542825 |
| 27 | 89160674 |
| 28 | 178442742 |
| 29 | 357081901 |
| 30 | 714481614 |
| 31 | 1429477456 |
| 32 | 2859786953 |
[0,0,1,2,6,13,30,64,137,286,594,1221,2498,5084, 10313,20858,42094,84797,170582,342760,688105, 1380390,2767546,5546037,11109786,22248228, 44542825,89160674,178442742,357081901,714481614, 1429477456,2859786953] |