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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 4 |
| 5 | 5 |
| 6 | 15 |
| 7 | 21 |
| 8 | 44 |
| 9 | 66 |
| 10 | 120 |
| 11 | 187 |
| 12 | 319 |
| 13 | 507 |
| 14 | 840 |
| 15 | 1348 |
| 16 | 2204 |
| 17 | 3553 |
| 18 | 5775 |
| 19 | 9329 |
| 20 | 15124 |
| 21 | 24454 |
| 22 | 39600 |
| 23 | 64055 |
| 24 | 103679 |
| 25 | 167735 |
| 26 | 271440 |
| 27 | 439176 |
| 28 | 710644 |
| 29 | 1149821 |
| 30 | 1860495 |
| 31 | 3010317 |
| 32 | 4870844 |
| 33 | 7881162 |
| 34 | 12752040 |
| 35 | 20633203 |
| 36 | 33385279 |
| 37 | 54018483 |
[0,0,0,4,5,15,21,44,66,120,187,319,507,840,1348, 2204,3553,5775,9329,15124,24454,39600,64055, 103679,167735,271440,439176,710644,1149821, 1860495,3010317,4870844,7881162,12752040,20633203, 33385279,54018483] |