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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 7 |
| 5 | 16 |
| 6 | 35 |
| 7 | 68 |
| 8 | 122 |
| 9 | 220 |
| 10 | 417 |
| 11 | 816 |
| 12 | 1588 |
| 13 | 3028 |
| 14 | 5707 |
| 15 | 10784 |
| 16 | 20547 |
| 17 | 39322 |
| 18 | 75150 |
| 19 | 143144 |
| 20 | 272212 |
| 21 | 517990 |
| 22 | 987005 |
| 23 | 1881824 |
| 24 | 3586808 |
| 25 | 6832874 |
| 26 | 13013780 |
| 27 | 24789200 |
| 28 | 47229672 |
| 29 | 89991518 |
| 30 | 171459667 |
| 31 | 326651952 |
| 32 | 622295173 |
| 33 | 1185547900 |
| 34 | 2258689217 |
| 35 | 4303264572 |
[1,2,3,4,7,16,35,68,122,220,417,816,1588,3028, 5707,10784,20547,39322,75150,143144,272212,517990, 987005,1881824,3586808,6832874,13013780,24789200, 47229672,89991518,171459667,326651952,622295173, 1185547900,2258689217,4303264572] |