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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 139 |
| 3 | 5741 |
| 4 | 229150 |
| 5 | 9062913 |
| 6 | 357398390 |
| 7 | 14082457465 |
| 8 | 554737340774 |
| 9 | 21850499916432 |
| 10 | 860643590653662 |
| 11 | 33898578158279334 |
| 12 | 1335175267629518426 |
| 13 | 52588965509249101477 |
| 14 | 2071337262002534945067 |
| 15 | 81584368108175368557177 |
[4,139,5741,229150,9062913,357398390,14082457465, 554737340774,21850499916432,860643590653662, 33898578158279334,1335175267629518426, 52588965509249101477,2071337262002534945067, 81584368108175368557177] |