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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 32 |
| 3 | 255 |
| 4 | 2032 |
| 5 | 16193 |
| 6 | 129042 |
| 7 | 1028335 |
| 8 | 8194796 |
| 9 | 65304285 |
| 10 | 520409494 |
| 11 | 4147140443 |
| 12 | 33048539760 |
| 13 | 263363634601 |
| 14 | 2098743379706 |
| 15 | 16724874641607 |
| 16 | 133280435560756 |
| 17 | 1062111070122677 |
| 18 | 8463957373270302 |
| 19 | 67449230529404275 |
[4,32,255,2032,16193,129042,1028335,8194796, 65304285,520409494,4147140443,33048539760, 263363634601,2098743379706,16724874641607, 133280435560756,1062111070122677,8463957373270302, 67449230529404275] |