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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 7 |
| 6 | 14 |
| 7 | 24 |
| 8 | 43 |
| 9 | 82 |
| 10 | 149 |
| 11 | 284 |
| 12 | 534 |
| 13 | 1015 |
| 14 | 1937 |
| 15 | 3713 |
| 16 | 7136 |
| 17 | 13759 |
| 18 | 26597 |
| 19 | 51537 |
| 20 | 100045 |
| 21 | 194586 |
| 22 | 378987 |
| 23 | 739161 |
| 24 | 1443465 |
| 25 | 2821923 |
| 26 | 5522689 |
| 27 | 10818037 |
| 28 | 21208747 |
| 29 | 41612533 |
| 30 | 81704494 |
| 31 | 160531078 |
| 32 | 315602635 |
| 33 | 620831732 |
| 34 | 1221915127 |
| 35 | 2406177404 |
| 36 | 4740454046 |
| 37 | 9343415302 |
| 38 | 18423548106 |
| 39 | 36342329321 |
[0,0,1,2,4,7,14,24,43,82,149,284,534,1015,1937, 3713,7136,13759,26597,51537,100045,194586,378987, 739161,1443465,2821923,5522689,10818037,21208747, 41612533,81704494,160531078,315602635,620831732, 1221915127,2406177404,4740454046,9343415302, 18423548106,36342329321] |