%I A013640
%S A013640 1,4203045807626,84060916163336,798578704207074
%N A013640 f-vector for 20-dimensional simplicial polytope providing counterexample 
               to unimodality conjecture.
%D A013640 G. M. Ziegler, Lect. on Polytopes, Springer 1995, p. 272.
%Y A013640 Sequence in context: A017664 A082250 A080123 this_sequence A139574 A094910 
               A023051
%Y A013640 Adjacent sequences: A013637 A013638 A013639 this_sequence A013641 A013642 
               A013643
%K A013640 nonn,fini
%O A013640 -1,2
%A A013640 N. J. A. Sloane (njas(AT)research.att.com).