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A009820 Expansion of tanh(tanh(log(1+x))). 0

%I #10 Jun 22 2015 22:37:56

%S 0,1,-1,-2,18,-44,-300,3928,-12544,-193160,3128040,-11235872,

%T -311721168,5932512496,-21553521808,-1023800851712,21959034049920,

%U -72153838392704,-5963595925511808,139976498126622976,-351219561048021760

%N Expansion of tanh(tanh(log(1+x))).

%t Tanh[ Tanh[ Log[ 1+x ] ] ]

%K sign,easy

%O 0,4

%A _R. H. Hardin_

%E Extended with signs by _Olivier GĂ©rard_, Mar 15 1997

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Last modified July 15 00:37 EDT 2024. Contains 374323 sequences. (Running on oeis4.)