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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 2 |
| 7 | 5 |
| 8 | 8 |
| 9 | 13 |
| 10 | 27 |
| 11 | 45 |
| 12 | 85 |
| 13 | 160 |
| 14 | 288 |
| 15 | 550 |
| 16 | 1024 |
| 17 | 1920 |
| 18 | 3654 |
| 19 | 6885 |
| 20 | 13107 |
| 21 | 24989 |
| 22 | 47616 |
| 23 | 91225 |
| 24 | 174760 |
| 25 | 335462 |
| 26 | 645435 |
| 27 | 1242600 |
| 28 | 2396745 |
| 29 | 4628480 |
| 30 | 8947294 |
| 31 | 17318945 |
| 32 | 33554432 |
| 33 | 65074253 |
| 34 | 126324495 |
| 35 | 245424829 |
| 36 | 477218560 |
| 37 | 928645120 |
| 38 | 1808400384 |
| 39 | 3524082400 |
| 40 | 6871947672 |
| 41 | 13408665600 |
| 42 | 26178873147 |
[0,1,0,1,2,2,5,8,13,27,45,85,160,288,550,1024, 1920,3654,6885,13107,24989,47616,91225,174760, 335462,645435,1242600,2396745,4628480,8947294, 17318945,33554432,65074253,126324495,245424829, 477218560,928645120,1808400384,3524082400, 6871947672,13408665600,26178873147] |