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2^(p-1)(2^p-1+Im((2^p-1)(-1)^(((2^p - 1)!)/(2^p - 1)^2 + 1/(2^p - 1) + 1))/sin(pi/(2^p-1))),p=1..20
2^(p-1)(2^p-1+Im((2^p-1)(-1)^(((2^p - 1)!)/(2^p - 1)^2 + 1/(2^p - 1) + 1))/sin(pi/(2^p-1))),p=1..20
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