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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 67108864 |
| 3 | 68719476736 |
| 4 | 1125899906842624 |
| 5 | 18446744073709551616 |
| 6 | 302231454903657293676544 |
| 7 | 1208925819614629174706176 |
| 8 | 4835703278458516698824704 |
| 9 | 77371252455336267181195264 |
| 10 | 316912650057057350374175801344 |
| 11 | 5192296858534827628530496329220096 |
[4,67108864,68719476736,1125899906842624, 18446744073709551616,302231454903657293676544, 1208925819614629174706176, 4835703278458516698824704, 77371252455336267181195264, 316912650057057350374175801344, 5192296858534827628530496329220096] |