4,1

Table of n, a(n) for n=4..108.

3282.139703... = 1/A111493.

cot(Pi/180)^2; evalf(%) ; # R. J. Mathar, Apr 03 2011

Cf. A073449, A019987.

Sequence in context: A305368 A197412 A275373 * A086774 A153461 A231981

Adjacent sequences: A113791 A113792 A113793 * A113795 A113796 A113797

cons,nonn

Mohammad K. Azarian, Jan 21 2006

Offset changed by Mohammad K. Azarian, Dec 13 2008

approved