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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 727 |
| 4 | 64357 |
| 5 | 7512151 |
| 6 | 1143589261 |
| 7 | 177189092767 |
| 8 | 23695071256837 |
| 9 | 2668384623898951 |
| 10 | 260281239918269821 |
| 11 | 22750998388694399407 |
| 12 | 1832528834698360763317 |
| 13 | 138901315742774351716951 |
| 14 | 10061570091146133148587181 |
| 15 | 704453005976484684303395647 |
[0,1,1,727,64357,7512151,1143589261,177189092767, 23695071256837,2668384623898951, 260281239918269821,22750998388694399407, 1832528834698360763317,138901315742774351716951, 10061570091146133148587181, 704453005976484684303395647] |