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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 4 |
| 7 | 7 |
| 8 | 13 |
| 9 | 25 |
| 10 | 50 |
| 11 | 99 |
| 12 | 196 |
| 13 | 392 |
| 14 | 783 |
| 15 | 1566 |
| 16 | 3131 |
| 17 | 6261 |
| 18 | 12521 |
| 19 | 25042 |
| 20 | 50084 |
| 21 | 100166 |
| 22 | 200332 |
| 23 | 400663 |
| 24 | 801325 |
| 25 | 1602649 |
| 26 | 3205298 |
| 27 | 6410595 |
| 28 | 12821190 |
| 29 | 25642379 |
| 30 | 51284758 |
[1,1,1,1,2,2,4,7,13,25,50,99,196,392,783,1566, 3131,6261,12521,25042,50084,100166,200332,400663, 801325,1602649,3205298,6410595,12821190,25642379, 51284758] |