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..50.
Sequence in context: A048165 A161040 A180234 * A133098 A145788 A117592
Adjacent sequences: A131056 A131057 A131058 * A131060 A131061 A131062
Hieronymus Fischer, Jun 12 2007, Jun 13 2007