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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 8 |
| 6 | 25 |
| 7 | 67 |
| 8 | 134 |
| 9 | 309 |
| 10 | 709 |
| 11 | 1579 |
| 12 | 3420 |
| 13 | 7240 |
| 14 | 15077 |
| 15 | 30997 |
| 16 | 61994 |
| 17 | 125364 |
| 18 | 253712 |
| 19 | 512411 |
| 20 | 1032453 |
| 21 | 2075737 |
| 22 | 4166469 |
| 23 | 8352851 |
| 24 | 16731873 |
| 25 | 33497422 |
| 26 | 67038086 |
| 27 | 134130344 |
| 28 | 268328977 |
| 29 | 536741608 |
| 30 | 1073586022 |
| 31 | 2147296425 |
| 32 | 4294592850 |
| 33 | 8589346462 |
| 34 | 17179033384 |
[0,0,0,1,2,8,25,67,134,309,709,1579,3420,7240, 15077,30997,61994,125364,253712,512411,1032453, 2075737,4166469,8352851,16731873,33497422, 67038086,134130344,268328977,536741608,1073586022, 2147296425,4294592850,8589346462,17179033384] |