%I A012817
%S A012817 1,3,5,217,2505,765963,6838195,9335128657,286658869905,
%T A012817 407628336475923,19130907180121195,42164783730598660297,
%U A012817 3124552441785986300505,9154657902519091515622683
%V A012817 1,3,5,-217,2505,765963,-6838195,-9335128657,286658869905,
%W A012817 407628336475923,-19130907180121195,-42164783730598660297,
%X A012817 3124552441785986300505,9154657902519091515622683
%N A012817 arcsinh(sec(x)*sinh(x))=x+3/3!*x^3+5/5!*x^5-217/7!*x^7+2505/9!*x^9...
%Y A012817 Sequence in context: A090953 A092947 A104996 this_sequence A087367 A058846 
               A101331
%Y A012817 Adjacent sequences: A012814 A012815 A012816 this_sequence A012818 A012819 
               A012820
%K A012817 sign
%O A012817 0,2
%A A012817 Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)