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A069962
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Define C(n) by the recursion C(0)=5*I where I^2=-1, C(n+1)=1/(1+C(n)); then a(n)=5*(-1)^n/Im(C(n)) where Im(z) denotes the imaginary part of the complex number z.
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2
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1, 26, 29, 109, 250, 689, 1769, 4666, 12181, 31925, 83546, 218761, 572689, 1499354, 3925325, 10276669, 26904634, 70437281, 184407161, 482784250, 1263945541, 3309052421, 8663211674, 22680582649, 59378536225, 155455026074
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