OFFSET
0,2
COMMENTS
The series terms for Pi/4 are 1, -1/3, 1/5, -1/7, 1/9, -1/11, + ...
Its inverse binomial transform is 1, -4/3, 28/15, -96/35, 1328/315, -4672/693, + ...
LINKS
Wikipedia, Leibniz series
MAPLE
L := [seq((-1)^n/(2*n+1), n=0..20)] ;
read("transforms") ; BINOMIALi(L) ;
apply(numer, %) ; # R. J. Mathar, Jul 06 2011
CROSSREFS
KEYWORD
frac,sign
AUTHOR
Paul Curtz, Feb 15 2010
EXTENSIONS
a(3) replaced with reduced numerator and a(5) onwards added by R. J. Mathar, Jul 06 2011
STATUS
approved