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=1..55.
Sequence in context: A063190 A101763 A154568 * A242732 A058633 A165143
Adjacent sequences: A020937 A020938 A020939 * A020941 A020942 A020943
More terms from James A. Sellers