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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 1 |
| 5 | 11 |
| 6 | 39 |
| 7 | 99 |
| 8 | 223 |
| 9 | 475 |
| 10 | 983 |
| 11 | 2003 |
| 12 | 4047 |
| 13 | 8139 |
| 14 | 16327 |
| 15 | 32707 |
| 16 | 65471 |
| 17 | 131003 |
| 18 | 262071 |
| 19 | 524211 |
| 20 | 1048495 |
| 21 | 2097067 |
| 22 | 4194215 |
| 23 | 8388515 |
| 24 | 16777119 |
| 25 | 33554331 |
| 26 | 67108759 |
| 27 | 134217619 |
| 28 | 268435343 |
| 29 | 536870795 |
| 30 | 1073741703 |
| 31 | 2147483523 |
| 32 | 4294967167 |
| 33 | 8589934459 |
| 34 | 17179869047 |
| 35 | 34359738227 |
| 36 | 68719476591 |
| 37 | 137438953323 |
| 38 | 274877906791 |
| 39 | 549755813731 |
| 40 | 1099511627615 |
[0,1,11,39,99,223,475,983,2003,4047,8139,16327, 32707,65471,131003,262071,524211,1048495,2097067, 4194215,8388515,16777119,33554331,67108759, 134217619,268435343,536870795,1073741703, 2147483523,4294967167,8589934459,17179869047, 34359738227,68719476591,137438953323,274877906791, 549755813731,1099511627615] |