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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | 4 |
| 3 | 72 |
| 4 | 38040 |
| 5 | 4020463392 |
| 6 | 18438434825136728352 |
| 7 | 340282363593610211921722192165556850240 |
| 8 | 115792089237316195072053288318104625954343609704705784618785209431974668731584 |
[2,4,4,72,38040,4020463392,18438434825136728352, 340282363593610211921722192165556850240, 11579208923731619507205328831810462595434360970470\ 5784618785209431974668731584] |