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=1..31.
Sequence in context: A021614 A019854 A025936 * A048376 A053422 A000461
Adjacent sequences: A158846 A158847 A158848 * A158850 A158851 A158852
Paul Curtz, Mar 28 2009
Edited by R. J. Mathar, Apr 04 2009