Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Table of n, a(n) for n=4..23.
Sequence in context: A000481 A215765 A055903 * A096046 A093117 A045724
Adjacent sequences: A026856 A026857 A026858 * A026860 A026861 A026862