I posted this to the seqfan list on Aug 15, but I never saw it, so maybe it wasn't distributed> My message said: From njas Tue Aug 15 16:03:59 2006 To: seqfans at seqfan.net Subject: nice problem from Tom Young and Barry Cipra! Reply-To: njas at research.att.com See A121176. NJAS , and the subject is the "organization number" of permutations. Neil