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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1089 |
| 3 | 31329 |
| 4 | 6487209 |
| 5 | 793041921 |
| 6 | 114228452529 |
| 7 | 15615593045649 |
| 8 | 2168295406671681 |
| 9 | 299696508681902721 |
| 10 | 41479887674695304025 |
| 11 | 5738727994104197560329 |
| 12 | 794048592071068202106225 |
[0,1089,31329,6487209,793041921,114228452529, 15615593045649,2168295406671681, 299696508681902721,41479887674695304025, 5738727994104197560329,794048592071068202106225] |