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..30.
Sequence in context: A170902 A000205 A136425 * A049866 A118355 A026632
Adjacent sequences: A005904 A005905 A005906 * A005908 A005909 A005910
N. J. A. Sloane.