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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 3 |
| 5 | 6 |
| 6 | 12 |
| 7 | 21 |
| 8 | 38 |
| 9 | 71 |
| 10 | 123 |
| 11 | 234 |
| 12 | 427 |
| 13 | 791 |
| 14 | 1477 |
| 15 | 2774 |
| 16 | 5222 |
| 17 | 9849 |
| 18 | 18659 |
| 19 | 35412 |
| 20 | 67410 |
| 21 | 128644 |
| 22 | 245959 |
| 23 | 471166 |
| 24 | 904186 |
| 25 | 1738238 |
| 26 | 3346542 |
| 27 | 6452030 |
| 28 | 12455921 |
| 29 | 24076458 |
| 30 | 46591766 |
| 31 | 90258683 |
| 32 | 175029533 |
[0,1,1,3,3,6,12,21,38,71,123,234,427,791,1477, 2774,5222,9849,18659,35412,67410,128644,245959, 471166,904186,1738238,3346542,6452030,12455921, 24076458,46591766,90258683,175029533] |