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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 8 |
| 6 | 16 |
| 7 | 31 |
| 8 | 52 |
| 9 | 98 |
| 10 | 179 |
| 11 | 323 |
| 12 | 590 |
| 13 | 1078 |
| 14 | 1945 |
| 15 | 3531 |
| 16 | 6421 |
| 17 | 11621 |
| 18 | 21041 |
| 19 | 38116 |
| 20 | 68904 |
| 21 | 124562 |
| 22 | 225138 |
| 23 | 406513 |
| 24 | 733710 |
| 25 | 1323803 |
[1,1,1,3,5,8,16,31,52,98,179,323,590,1078,1945, 3531,6421,11621,21041,38116,68904,124562,225138, 406513,733710,1323803] |