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=1..17.
Cf. A002808, A000290.
Sequence in context: A064751 A045787 A067474 * A173038 A198971 A273230
Adjacent sequences: A053766 A053767 A053768 * A053770 A053771 A053772
G. L. Honaker, Jr., Mar 29 2000
a(9)-a(15) from Donovan Johnson, Dec 04 2009
a(16)-a(17) from Donovan Johnson, Jun 09 2011