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| n | a(n) |
|---|---|
| 1 | 60 |
| 2 | 256 |
| 3 | 1136 |
| 4 | 5728 |
| 5 | 31652 |
| 6 | 170728 |
| 7 | 943584 |
| 8 | 5175034 |
| 9 | 28475596 |
| 10 | 156707492 |
| 11 | 861735284 |
| 12 | 4742758462 |
| 13 | 26087819020 |
| 14 | 143545024690 |
| 15 | 789722083016 |
| 16 | 4344918701514 |
| 17 | 23904948840000 |
| 18 | 131519096655384 |
| 19 | 723594734816028 |
[60,256,1136,5728,31652,170728,943584,5175034, 28475596,156707492,861735284,4742758462, 26087819020,143545024690,789722083016, 4344918701514,23904948840000,131519096655384, 723594734816028] |