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..19.
Sequence in context: A013833 A100636 A016796 * A278142 A013759 A016832
Adjacent sequences: A018874 A018875 A018876 * A018878 A018879 A018880
David W. Wilson