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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 7 |
| 5 | 63 |
| 6 | 1023 |
| 7 | 32760 |
| 8 | 1048544 |
| 9 | 33554304 |
| 10 | 1073741312 |
| 11 | 34359736320 |
| 12 | 1099511619584 |
| 13 | 35184370221056 |
| 14 | 1125899873681408 |
| 15 | 36028796752101376 |
[0,0,1,7,63,1023,32760,1048544,33554304, 1073741312,34359736320,1099511619584, 35184370221056,1125899873681408,36028796752101376] |