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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 7 |
| 3 | 63 |
| 4 | 1023 |
| 5 | 32767 |
| 6 | 2097151 |
| 7 | 268435455 |
| 8 | 68719476735 |
| 9 | 35184372088831 |
| 10 | 36028797018963967 |
| 11 | 73786976294838206463 |
| 12 | 302231454903657293676543 |
| 13 | 2475880078570760549798248447 |
| 14 | 40564819207303340847894502572031 |
| 15 | 1329227995784915872903807060280344575 |
[0,1,7,63,1023,32767,2097151,268435455, 68719476735,35184372088831,36028797018963967, 73786976294838206463,302231454903657293676543, 2475880078570760549798248447, 40564819207303340847894502572031, 1329227995784915872903807060280344575] |