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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 0 |
| 3 | 127 |
| 4 | 0 |
| 5 | 2047 |
| 6 | 0 |
| 7 | 32767 |
| 8 | 0 |
| 9 | 524287 |
| 10 | 0 |
| 11 | 8388607 |
| 12 | 0 |
| 13 | 134217727 |
| 14 | 0 |
| 15 | 2147483647 |
| 16 | 0 |
| 17 | 34359738367 |
| 18 | 0 |
| 19 | 549755813887 |
| 20 | 0 |
| 21 | 8796093022207 |
| 22 | 0 |
| 23 | 140737488355327 |
| 24 | 0 |
| 25 | 2251799813685247 |
| 26 | 0 |
| 27 | 36028797018963967 |
| 28 | 0 |
| 29 | 576460752303423487 |
| 30 | 0 |
| 31 | 9223372036854775807 |
| 32 | 0 |
[1,7,0,127,0,2047,0,32767,0,524287,0,8388607,0, 134217727,0,2147483647,0,34359738367,0, 549755813887,0,8796093022207,0,140737488355327,0, 2251799813685247,0,36028797018963967,0, 576460752303423487,0,9223372036854775807,0] |