OFFSET
0,1
COMMENTS
The Schramm triangle is the lower triangular part of the square array A191898 times Cos(k/n*2*Pi).
FORMULA
Equals Sum[Cos[2*Pi*2/(n + 0)]/(n + 0) - Cos[2*Pi*2/(n + 1)]/(n + 1), {n, 1, Infinity, 2}]
EXAMPLE
0.4790882572765523426...
MATHEMATICA
RealDigits[N[Sum[Cos[2*Pi*2/(n + 0)]/(n + 0) - Cos[2*Pi*2/(n + 1)]/(n + 1), {n, 1, Infinity, 2}], 90]][[1]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Mats Granvik, Mar 24 2012
EXTENSIONS
Offset corrected by and more terms from Rick L. Shepherd, Jan 07 2014
STATUS
approved