| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 1 |
| 3 | 4 |
| 4 | 7 |
| 5 | 12 |
| 6 | 23 |
| 7 | 42 |
| 8 | 77 |
| 9 | 142 |
| 10 | 261 |
| 11 | 480 |
| 12 | 883 |
| 13 | 1624 |
| 14 | 2987 |
| 15 | 5494 |
| 16 | 10105 |
| 17 | 18586 |
| 18 | 34185 |
| 19 | 62876 |
| 20 | 115647 |
| 21 | 212708 |
| 22 | 391231 |
| 23 | 719586 |
| 24 | 1323525 |
| 25 | 2434342 |
| 26 | 4477453 |
| 27 | 8235320 |
| 28 | 15147115 |
| 29 | 27859888 |
| 30 | 51242323 |
| 31 | 94249326 |
| 32 | 173351537 |
| 33 | 318843186 |
| 34 | 586444049 |
[1,2,1,4,7,12,23,42,77,142,261,480,883,1624,2987, 5494,10105,18586,34185,62876,115647,212708,391231, 719586,1323525,2434342,4477453,8235320,15147115, 27859888,51242323,94249326,173351537,318843186, 586444049] |