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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 26 |
| 3 | 268 |
| 4 | 3851 |
| 5 | 69308 |
| 6 | 1459552 |
| 7 | 34513468 |
| 8 | 893162569 |
| 9 | 24873809192 |
| 10 | 736914860764 |
| 11 | 23034718900652 |
| 12 | 755096654861093 |
| 13 | 25838920473462512 |
| 14 | 919688365896843632 |
| 15 | 33951797935609852260 |
| 16 | 1296987353334993492885 |
[1,4,26,268,3851,69308,1459552,34513468,893162569, 24873809192,736914860764,23034718900652, 755096654861093,25838920473462512, 919688365896843632,33951797935609852260, 1296987353334993492885] |