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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 4 |
| 8 | 9 |
| 9 | 13 |
| 10 | 26 |
| 11 | 40 |
| 12 | 74 |
| 13 | 118 |
| 14 | 210 |
| 15 | 342 |
| 16 | 595 |
| 17 | 981 |
| 18 | 1684 |
| 19 | 2798 |
| 20 | 4763 |
| 21 | 7951 |
| 22 | 13469 |
| 23 | 22548 |
| 24 | 38082 |
| 25 | 63862 |
| 26 | 107666 |
| 27 | 180740 |
| 28 | 304382 |
| 29 | 511292 |
| 30 | 860504 |
| 31 | 1445998 |
| 32 | 2432665 |
| 33 | 4088805 |
| 34 | 6877172 |
| 35 | 11560684 |
| 36 | 19441791 |
| 37 | 32684789 |
| 38 | 54961955 |
| 39 | 92404472 |
| 40 | 155377371 |
| 41 | 261235027 |
[0,0,0,1,1,3,4,9,13,26,40,74,118,210,342,595,981, 1684,2798,4763,7951,13469,22548,38082,63862, 107666,180740,304382,511292,860504,1445998, 2432665,4088805,6877172,11560684,19441791, 32684789,54961955,92404472,155377371,261235027] |