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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 28 |
| 3 | 248 |
| 4 | 2032 |
| 5 | 262112 |
| 6 | 8388544 |
| 7 | 67108736 |
| 8 | 549755813632 |
| 9 | 1180591620717411302912 |
| 10 | 633825300114114700748351601664 |
| 11 | 332306998946228968225951765070084096 |
| 12 | 696898287454081973172991196020261297057792 |
[6,28,248,2032,262112,8388544,67108736, 549755813632,1180591620717411302912, 633825300114114700748351601664, 332306998946228968225951765070084096, 696898287454081973172991196020261297057792] |