%I A060307
%S A060307 1,3,1365,8534295,204893714025,15735481638151275,
%T A060307 2760485970394430603325,1006427270776555103089989375,
%U A060307 659316841888260316767029819420625
%N A060307 Number of degree-4n permutations without odd cycles and such that number 
               of cycles of size 2k is even (or zero) for every k.
%F A060307 E.g.f.: Product_{k >= 1} cosh x^(2k)/(2k).
%Y A060307 Cf. A003483.
%Y A060307 Cf. A013302.
%Y A060307 Sequence in context: A129078 A122389 A036066 this_sequence A119111 A118050 
               A116994
%Y A060307 Adjacent sequences: A060304 A060305 A060306 this_sequence A060308 A060309 
               A060310
%K A060307 easy,nonn
%O A060307 0,2
%A A060307 Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 28 2001, Aug 10 2007