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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | 21 |
| 3 | 55 |
| 4 | 118 |
| 5 | 229 |
| 6 | 419 |
| 7 | 738 |
| 8 | 1267 |
| 9 | 2137 |
| 10 | 3560 |
| 11 | 5879 |
| 12 | 9649 |
| 13 | 15768 |
| 14 | 25689 |
| 15 | 41763 |
| 16 | 67794 |
| 17 | 109937 |
| 18 | 178171 |
| 19 | 288614 |
| 20 | 467337 |
| 21 | 756551 |
| 22 | 1224538 |
| 23 | 1981791 |
| 24 | 3207085 |
| 25 | 5189688 |
| 26 | 8397643 |
| 27 | 13588261 |
| 28 | 21986896 |
| 29 | 35576213 |
| 30 | 57564231 |
| 31 | 93141634 |
| 32 | 150707125 |
| 33 | 243850091 |
| 34 | 394558622 |
[2,4,21,55,118,229,419,738,1267,2137,3560,5879, 9649,15768,25689,41763,67794,109937,178171,288614, 467337,756551,1224538,1981791,3207085,5189688, 8397643,13588261,21986896,35576213,57564231, 93141634,150707125,243850091,394558622] |