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| n | a(n) |
|---|---|
| -1 | 1 |
| 0 | 0 |
| 1 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | 1 |
| 5 | 3 |
| 6 | 3 |
| 7 | 5 |
| 8 | 6 |
| 9 | 10 |
| 10 | 13 |
| 11 | 19 |
| 12 | 26 |
| 13 | 38 |
| 14 | 53 |
| 15 | 75 |
| 16 | 106 |
| 17 | 150 |
| 18 | 212 |
| 19 | 300 |
| 20 | 424 |
| 21 | 600 |
| 22 | 848 |
| 23 | 1200 |
| 24 | 1696 |
| 25 | 2400 |
| 26 | 3393 |
| 27 | 4799 |
| 28 | 6786 |
| 29 | 9598 |
| 30 | 13572 |
| 31 | 19196 |
| 32 | 27145 |
| 33 | 38391 |
| 34 | 54291 |
| 35 | 76781 |
| 36 | 108583 |
| 37 | 153561 |
| 38 | 217167 |
| 39 | 307121 |
| 40 | 434334 |
| 41 | 614242 |
| 42 | 868668 |
| 43 | 1228484 |
| 44 | 1737337 |
| 45 | 2456967 |
| 46 | 3474675 |
| 47 | 4913933 |
[1,0,1,0,2,1,3,3,5,6,10,13,19,26,38,53,75,106,150, 212,300,424,600,848,1200,1696,2400,3393,4799,6786, 9598,13572,19196,27145,38391,54291,76781,108583, 153561,217167,307121,434334,614242,868668,1228484, 1737337,2456967,3474675,4913933] |