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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 6 |
| 5 | 8 |
| 6 | 18 |
| 7 | 30 |
| 8 | 57 |
| 9 | 103 |
| 10 | 194 |
| 11 | 360 |
| 12 | 682 |
| 13 | 1292 |
| 14 | 2464 |
| 15 | 4721 |
| 16 | 9078 |
| 17 | 17481 |
| 18 | 33808 |
| 19 | 65485 |
| 20 | 127116 |
| 21 | 247179 |
| 22 | 481426 |
| 23 | 938950 |
| 24 | 1833572 |
| 25 | 3584679 |
| 26 | 7015237 |
| 27 | 13741715 |
| 28 | 26940645 |
| 29 | 52858250 |
| 30 | 103785060 |
| 31 | 203913141 |
| 32 | 400891200 |
| 33 | 788601863 |
| 34 | 1552114600 |
[1,1,2,2,6,8,18,30,57,103,194,360,682,1292,2464, 4721,9078,17481,33808,65485,127116,247179,481426, 938950,1833572,3584679,7015237,13741715,26940645, 52858250,103785060,203913141,400891200,788601863, 1552114600] |