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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 69 |
| 3 | 966 |
| 4 | 9936 |
| 5 | 44436777 |
| 6 | 888444222111 |
| 7 | 2222007555500 |
| 8 | 3333300366666006 |
| 9 | 555550050888880080 |
| 10 | 99999009006666600600 |
| 11 | 99999999978 |
| 12 | 666666666060999999999090 |
| 13 | 88888808008085555550500505 |
| 14 | 6666666660600033333333303000 |
| 15 | 555555550055550222222220022220 |
[0,69,966,9936,44436777,888444222111, 2222007555500,3333300366666006,555550050888880080, 99999009006666600600,99999999978, 666666666060999999999090, 88888808008085555550500505, 6666666660600033333333303000, 555555550055550222222220022220] |