request for help with obscure sequence

[A.N.W.Hone at kent.ac.uk]

Sorry, there was a typo in the Latex of the formula for the nth term of A122046. The formula for 
the degrees d_n should read

\frac{1}{4\sqrt{2}}\cos((2n+1)\pi / 4)+\frac{1}{96}(2n+3)(2n^2+6n-5)+\frac{1}{32}(-1)^n. 

Andy 
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