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%I #4 Feb 24 2012 12:51:10
%S 1,1,25,1225,108113,15283505,3167087273,904365439289,340377095938337,
%T 163284306442648801,97251848546749385145,70412470931263247515689,
%U 60905917762268697815507057,62032377805368358044198610705
%N sec(sec(x)*arctanh(x))=1+1/2!*x^2+25/4!*x^4+1225/6!*x^6+108113/8!*x^8...
%K nonn
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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