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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 8 |
| 4 | 18 |
| 5 | 30 |
| 6 | 58 |
| 7 | 90 |
| 8 | 153 |
| 9 | 233 |
| 10 | 365 |
| 11 | 533 |
| 12 | 806 |
| 13 | 1142 |
| 14 | 1652 |
| 15 | 2308 |
| 16 | 3243 |
| 17 | 4431 |
| 18 | 6103 |
| 19 | 8203 |
| 20 | 11080 |
| 21 | 14710 |
| 22 | 19540 |
| 23 | 25612 |
| 24 | 33612 |
| 25 | 43570 |
| 26 | 56476 |
| 27 | 72548 |
| 28 | 93080 |
| 29 | 118490 |
| 30 | 150699 |
| 31 | 190315 |
| 32 | 240046 |
| 33 | 301042 |
| 34 | 376887 |
| 35 | 469515 |
| 36 | 583993 |
| 37 | 723073 |
| 38 | 893815 |
| 39 | 1100615 |
| 40 | 1352888 |
[1,1,4,8,18,30,58,90,153,233,365,533,806,1142, 1652,2308,3243,4431,6103,8203,11080,14710,19540, 25612,33612,43570,56476,72548,93080,118490,150699, 190315,240046,301042,376887,469515,583993,723073, 893815,1100615,1352888] |