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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 32 |
| 3 | 512 |
| 4 | 4096 |
| 5 | 131072 |
| 6 | 1048576 |
| 7 | 16777216 |
| 8 | 134217728 |
| 9 | 8589934592 |
| 10 | 68719476736 |
| 11 | 1099511627776 |
| 12 | 8796093022208 |
| 13 | 281474976710656 |
| 14 | 2251799813685248 |
| 15 | 36028797018963968 |
| 16 | 288230376151711744 |
| 17 | 36893488147419103232 |
| 18 | 295147905179352825856 |
| 19 | 4722366482869645213696 |
| 20 | 37778931862957161709568 |
[4,32,512,4096,131072,1048576,16777216,134217728, 8589934592,68719476736,1099511627776, 8796093022208,281474976710656,2251799813685248, 36028797018963968,288230376151711744, 36893488147419103232,295147905179352825856, 4722366482869645213696,37778931862957161709568] |