OFFSET
1,1
FORMULA
Equals Sum_{k>=0} 2^k/binomial(2*k+2,k). - Amiram Eldar, Jun 30 2020
EXAMPLE
2.0707963267948966192313216916397514420985846996875529...
PROG
(Sage) N((1+pi)/2, digits=110)
(PARI) (1 + Pi)/2 \\ Altug Alkan, Apr 07 2016
CROSSREFS
KEYWORD
cons,nonn
AUTHOR
Jani Melik, Feb 26 2016
STATUS
approved