Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
Table of n, a(n) for n=0..19.
Cosh[ Log[ 1+Tan[ x ] ] ]
Sequence in context: A037788 A037669 A228066 * A037795 A228750 A187442
Adjacent sequences: A009122 A009123 A009124 * A009126 A009127 A009128
R. H. Hardin
Extended with signs Mar 15 1997 by Olivier Gérard.