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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 8 |
| 5 | 13 |
| 6 | 26 |
| 7 | 54 |
| 8 | 101 |
| 9 | 174 |
| 10 | 370 |
| 11 | 743 |
| 12 | 1397 |
| 13 | 2552 |
| 14 | 5353 |
| 15 | 10636 |
| 16 | 20120 |
| 17 | 38138 |
| 18 | 78753 |
| 19 | 155793 |
| 20 | 296248 |
| 21 | 573382 |
| 22 | 1173183 |
| 23 | 2316317 |
| 24 | 4423690 |
| 25 | 8673078 |
| 26 | 17641499 |
| 27 | 34801731 |
| 28 | 66705394 |
| 29 | 131894869 |
| 30 | 267203186 |
| 31 | 526966454 |
| 32 | 1013155981 |
[1,1,4,8,13,26,54,101,174,370,743,1397,2552,5353, 10636,20120,38138,78753,155793,296248,573382, 1173183,2316317,4423690,8673078,17641499,34801731, 66705394,131894869,267203186,526966454,1013155981] |