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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 7 |
| 3 | 0 |
| 4 | 31 |
| 5 | 0 |
| 6 | 127 |
| 7 | 0 |
| 8 | 511 |
| 9 | 0 |
| 10 | 2047 |
| 11 | 0 |
| 12 | 8191 |
| 13 | 48 |
| 14 | 32767 |
| 15 | 252 |
| 16 | 130951 |
| 17 | 816 |
| 18 | 524223 |
| 19 | 4080 |
| 20 | 2095135 |
| 21 | 960 |
| 22 | 8386687 |
| 23 | 3852 |
| 24 | 33546495 |
| 25 | 16140 |
| 26 | 134185471 |
| 27 | 65052 |
| 28 | 536740855 |
| 29 | 3407400 |
| 30 | 2146963711 |
| 31 | 15990624 |
| 32 | 8583516671 |
| 33 | 50462072 |
| 34 | 34359613391 |
| 35 | 251787268 |
| 36 | 137338173439 |
[1,0,7,0,31,0,127,0,511,0,2047,0,8191,48,32767, 252,130951,816,524223,4080,2095135,960,8386687, 3852,33546495,16140,134185471,65052,536740855, 3407400,2146963711,15990624,8583516671,50462072, 34359613391,251787268,137338173439] |