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..21.
Log[ 1+Tan[ x ]/Cosh[ x ] ]
Sequence in context: A226418 A196011 A080515 * A063264 A024533 A220276
Adjacent sequences: A009378 A009379 A009380 * A009382 A009383 A009384
R. H. Hardin
Extended with signs Mar 15 1997 by Olivier Gérard.