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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 2 |
| 8 | 3 |
| 9 | 5 |
| 10 | 7 |
| 11 | 10 |
| 12 | 13 |
| 13 | 18 |
| 14 | 24 |
| 15 | 32 |
| 16 | 40 |
| 17 | 51 |
| 18 | 66 |
| 19 | 83 |
| 20 | 103 |
| 21 | 128 |
| 22 | 158 |
| 23 | 194 |
| 24 | 237 |
| 25 | 288 |
| 26 | 348 |
| 27 | 419 |
| 28 | 500 |
| 29 | 612 |
[0,0,0,0,1,1,2,3,5,7,10,13,18,24,32,40,51,66,83, 103,128,158,194,237,288,348,419,500,612] |