the good Superseeker gave me a hit on a search: lgdegf 64-192*a(n)+240*a(n)^2-160*a(n)^3+60*a(n)^4-12*a(n)^5+a(n)^6 I forgot how to reconstruct, extend (and verify) the sequence I submitted. Can anyone help me remember how to do it? Wouter.