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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 48 |
| 4 | 466 |
| 5 | 4444 |
| 6 | 46701 |
| 7 | 467104 |
| 8 | 4833331 |
| 9 | 52153064 |
| 10 | 578390147 |
| 11 | 6590059758 |
| 12 | 79294094586 |
| 13 | 1014580074422 |
| 14 | 13933640462306 |
| 15 | 204079081718026 |
[0,4,48,466,4444,46701,467104,4833331,52153064, 578390147,6590059758,79294094586,1014580074422, 13933640462306,204079081718026] |