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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 7 |
| 5 | 13 |
| 6 | 25 |
| 7 | 46 |
| 8 | 85 |
| 9 | 160 |
| 10 | 301 |
| 11 | 561 |
| 12 | 1056 |
| 13 | 1984 |
| 14 | 3730 |
| 15 | 7037 |
| 16 | 13273 |
| 17 | 25056 |
| 18 | 47382 |
| 19 | 89666 |
| 20 | 169833 |
| 21 | 322038 |
| 22 | 611128 |
| 23 | 1160660 |
| 24 | 2206219 |
| 25 | 4196730 |
| 26 | 7988731 |
| 27 | 15217557 |
| 28 | 29005987 |
| 29 | 55321015 |
| 30 | 105570219 |
| 31 | 201569648 |
| 32 | 385059094 |
| 33 | 735929616 |
| 34 | 1407145439 |
| 35 | 2691681402 |
[1,1,2,4,7,13,25,46,85,160,301,561,1056,1984,3730, 7037,13273,25056,47382,89666,169833,322038,611128, 1160660,2206219,4196730,7988731,15217557,29005987, 55321015,105570219,201569648,385059094,735929616, 1407145439,2691681402] |