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..43.
Same as A050036 and A050052 except for second term.
Sequence in context: A047249 A228941 A236211 * A190211 A136120 A217040
Adjacent sequences: A050065 A050066 A050067 * A050069 A050070 A050071