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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 4 |
| 5 | 11 |
| 6 | 20 |
| 7 | 35 |
| 8 | 56 |
| 9 | 113 |
| 10 | 207 |
| 11 | 326 |
| 12 | 602 |
| 13 | 985 |
| 14 | 1777 |
| 15 | 3124 |
| 16 | 5115 |
| 17 | 8523 |
| 18 | 15011 |
| 19 | 24519 |
| 20 | 41571 |
| 21 | 71096 |
| 22 | 115650 |
| 23 | 191940 |
| 24 | 320651 |
| 25 | 530167 |
| 26 | 865781 |
| 27 | 1442059 |
| 28 | 2358158 |
| 29 | 3833007 |
| 30 | 6325067 |
| 31 | 10243259 |
| 32 | 16603455 |
| 33 | 27151086 |
| 34 | 43734197 |
| 35 | 71032191 |
| 36 | 115091799 |
| 37 | 184492464 |
[1,1,1,4,4,11,20,35,56,113,207,326,602,985,1777, 3124,5115,8523,15011,24519,41571,71096,115650, 191940,320651,530167,865781,1442059,2358158, 3833007,6325067,10243259,16603455,27151086, 43734197,71032191,115091799,184492464] |