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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 16 |
| 3 | 50 |
| 4 | 1407 |
| 5 | 11784 |
| 6 | 182524 |
| 7 | 2017564 |
| 8 | 26614749 |
| 9 | 319184574 |
| 10 | 4025795483 |
| 11 | 49427052472 |
| 12 | 615583634915 |
| 13 | 7608564525014 |
| 14 | 94422452015321 |
| 15 | 1169266780165296 |
| 16 | 14496003421951958 |
| 17 | 179605335059387526 |
| 18 | 2226026121739586735 |
[0,16,50,1407,11784,182524,2017564,26614749, 319184574,4025795483,49427052472,615583634915, 7608564525014,94422452015321,1169266780165296, 14496003421951958,179605335059387526, 2226026121739586735] |