[seqfan] Re: Surprising Patterns in Tangent and Secant Numbers

Paul D Hanna pauldhanna at juno.com
Tue Nov 10 08:23:47 CET 2009

     I suppose that the proofs of the main observations in my prior email 
could start with establishing the following identity (in PARI notation): 
= x + x/serreverse(x*serlaplace(1/cosh(x)))
= 1 + x - x^2 + 3*x^4 - 38*x^6 + 947*x^8 - 37394*x^10 +...
Is this identity easy to prove? 
Cf. A157308. 

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