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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 7 |
| 6 | 14 |
| 7 | 31 |
| 8 | 63 |
| 9 | 126 |
| 10 | 253 |
| 11 | 509 |
| 12 | 1021 |
| 13 | 2045 |
| 14 | 4094 |
| 15 | 8189 |
| 16 | 16380 |
| 17 | 32763 |
| 18 | 65531 |
| 19 | 131067 |
| 20 | 262140 |
| 21 | 524285 |
| 22 | 1048571 |
| 23 | 2097146 |
| 24 | 4194297 |
| 25 | 8388603 |
| 26 | 16777208 |
| 27 | 33554424 |
| 28 | 67108858 |
| 29 | 134217720 |
| 30 | 268435446 |
| 31 | 536870902 |
| 32 | 1073741816 |
| 33 | 2147483642 |
| 34 | 4294967289 |
| 35 | 8589934584 |
| 36 | 17179869176 |
| 37 | 34359738358 |
| 38 | 68719476729 |
[0,0,0,1,3,7,14,31,63,126,253,509,1021,2045,4094, 8189,16380,32763,65531,131067,262140,524285, 1048571,2097146,4194297,8388603,16777208,33554424, 67108858,134217720,268435446,536870902,1073741816, 2147483642,4294967289,8589934584,17179869176, 34359738358,68719476729] |