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| n | a(n) |
|---|---|
| 4 | 64 |
| 5 | 708 |
| 6 | 9421 |
| 7 | 148992 |
| 8 | 2742090 |
| 9 | 57671104 |
| 10 | 1365730231 |
| 11 | 35980443648 |
| 12 | 1044117402868 |
| 13 | 33098695234560 |
| 14 | 1138160856018369 |
| 15 | 42200676331159552 |
| 16 | 1678427133899138494 |
| 17 | 71282668099352051712 |
| 18 | 3219814814790580711915 |
| 19 | 154137012617228775849984 |
| 20 | 7795444201708762192584744 |
| 21 | 415337944634097426474729472 |
[64,708,9421,148992,2742090,57671104,1365730231, 35980443648,1044117402868,33098695234560, 1138160856018369,42200676331159552, 1678427133899138494,71282668099352051712, 3219814814790580711915,154137012617228775849984, 7795444201708762192584744, 415337944634097426474729472] |