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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 134217728 |
| 2 | 68719476736 |
| 3 | 2641807540224 |
| 4 | 35184372088832 |
| 5 | 262144000000000 |
| 6 | 1352605460594688 |
| 7 | 5416169448144896 |
| 8 | 18014398509481984 |
| 9 | 51998697814228992 |
| 10 | 134217728000000000 |
| 11 | 316478381828866048 |
| 12 | 692533995824480256 |
[0,134217728,68719476736,2641807540224, 35184372088832,262144000000000,1352605460594688, 5416169448144896,18014398509481984, 51998697814228992,134217728000000000, 316478381828866048,692533995824480256] |