-1,1

In radians.

No closed form expression is known.

Probably transcendental but this has not been proved.

Table of n, a(n) for n=-1..103.

0.03495651208261930158644589194024062940557322507971088508629895299993300186...

RealDigits[ Fold[ Cos[#1 + #2] &, 0, Reverse[ Range@ 295]], 10, 111][[1]]

Sequence in context: A011292 A021745 A190285 * A247567 A271529 A070154

Adjacent sequences: A276518 A276519 A276520 * A276522 A276523 A276524

nonn,cons

Robert G. Wilson v, Apr 09 2017

approved