Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 4500 articles have referenced us, often saying "we would not have discovered this result without the OEIS".
Table of n, a(n) for n=0..66.
Sequence in context: A174955 A224095 A130735 * A022835 A022834 A046610
Adjacent sequences: A055673 A055674 A055675 * A055677 A055678 A055679
Clark Kimberling, Jun 08 2000