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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 10 |
| 6 | 20 |
| 7 | 38 |
| 8 | 74 |
| 9 | 144 |
| 10 | 282 |
| 11 | 552 |
| 12 | 1086 |
| 13 | 2144 |
| 14 | 4247 |
| 15 | 8430 |
| 16 | 16761 |
| 17 | 33364 |
| 18 | 66479 |
| 19 | 132566 |
| 20 | 264520 |
| 21 | 528078 |
| 22 | 1054636 |
| 23 | 2106854 |
| 24 | 4209853 |
| 25 | 8413548 |
| 26 | 16817253 |
| 27 | 33618758 |
| 28 | 67212301 |
| 29 | 134384182 |
| 30 | 268703498 |
| 31 | 537302782 |
| 32 | 1074437977 |
| 33 | 2148606246 |
[0,1,2,5,10,20,38,74,144,282,552,1086,2144,4247, 8430,16761,33364,66479,132566,264520,528078, 1054636,2106854,4209853,8413548,16817253,33618758, 67212301,134384182,268703498,537302782,1074437977, 2148606246] |