Neil, seqfans, I added (simple) formula, Thanks, Zak %I A060488 %S A060488 4,13,28,50,80,119,168,228,300,385,484,598 %F A060488 a(n)=n(n+1)(n+11)/6 %A A060488 Zak Seidov, Jun 15 2006 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com