In the OEIS, A000179 starts out 1, 1, 0, 1, 2, 13, 80, ... In the Mathworld article "Married Couples Problem", A000179 starts out -1, 1, 0, 2, 13, 80, ... Which is correct? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://list.seqfan.eu/pipermail/seqfan/attachments/20030207/4db1fd69/attachment.htm>