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User:Jaume Oliver Lafont/C((d+1)n+d,d)
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= 1/A086089 [1] Centered nonagonal numbers A060544
[2]
Odd tetrahedral numbers A015219
Contents
Even d
For even values of , a general expression in terms of alternating sign binomial coefficients and cotangent values follows from the identity
(General expression for odd values of ?)
Notes on the digamma function
Trigonometric functions defined from