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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 72 |
| 3 | 9360 |
| 4 | 993600 |
| 5 | 889928800 |
| 6 | 98899208800 |
| 7 | 9988992008800 |
| 8 | 999889920008800 |
| 9 | 99998899200008800 |
| 10 | 88888898888888880888888888 |
| 11 | 98888889888088888808880888888 |
| 12 | 99888888988800888888088800888888 |
| 13 | 99988888898880008888880888000888888 |
[0,72,9360,993600,889928800,98899208800, 9988992008800,999889920008800,99998899200008800, 88888898888888880888888888, 98888889888088888808880888888, 99888888988800888888088800888888, 99988888898880008888880888000888888] |