%I A025580
%S A025580 1,0,1,5,13,1,41,383,901,47,1945,26141,29368,6359,296509,345525,756291,
%T A025580 197211,10483329,225371001,242537898,3394965,204481239,5215763433
%V A025580 1,0,1,5,13,-1,41,383,901,-47,1945,26141,29368,-6359,296509,345525,756291,
%W A025580 -197211,10483329,225371001,242537898,-3394965,204481239,5215763433
%N A025580 a(n) = (1/1 - 1/(n-1) + ... + d/binomial(n-[ n/2 ],[ n/2 ]))*L, where 
               L = LCM{1, n-1, ..., binomial(n-[ n/2 ],[ n/2 ])}, d = (-1)^n.
%Y A025580 Sequence in context: A047658 A146542 A116058 this_sequence A073878 A065934 
               A035412
%Y A025580 Adjacent sequences: A025577 A025578 A025579 this_sequence A025581 A025582 
               A025583
%K A025580 sign
%O A025580 0,4
%A A025580 Clark Kimberling (ck6(AT)evansville.edu)