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A351696
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a(n) is the numerator of the squared circumradius of a cyclic quadrilateral with sides n, n+1, n+2, n+3.
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2
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385, 3289, 1729, 53041, 146329, 38665, 741169, 1449721, 294409, 4582249, 7568185, 1335961, 18477481, 27589921, 4463641, 57210985, 79885729, 12177649, 147998761, 197007889, 28761265, 336087409, 431638801, 60980689, 691402609, 863589385, 118901521, 1316247361, 1607847241
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OFFSET
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1,1
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LINKS
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FORMULA
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a(n) = numerator((2*n^6 + 18*n^5 + 65*n^4 + 120*n^3 + 117*n^2 + 54*n + 9)/(n^4 + 6*n^3 + 11*n^2 + 6*n)).
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EXAMPLE
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385/96, 3289/480, 1729/160, 53041/3360, 146329/6720, 38665/1344, ...
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CROSSREFS
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32*A351697(n) are the corresponding denominators.
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KEYWORD
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nonn,frac
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AUTHOR
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STATUS
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approved
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