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..23.
Sequence in context: A000336 A235041 A080613 * A139050 A043309 A104386
Adjacent sequences: A055003 A055004 A055005 * A055007 A055008 A055009
Stephen G. Penrice (spenrice(AT)ets.org), May 30 2000