%I A069704
%S A069704 9,2401,7139584,7429060864,8768304271322176,55287838983612748529926144,
%T A069704 28712457542131501655125523112656896,
%U A069704 597353290725130889841630014909751870078582784
%N A069704 Let M_2n be the 2n X 2n matrix M_(i,j)=C(2i,j)-C(2j,i) where C(k,l) denotes 
               the binomial coefficients; then a(n)=det(M_2n).
%C A069704 det(M_{2n+1})=0
%Y A069704 Cf. A005249, A060739, A067689.
%Y A069704 Sequence in context: A162091 A013827 A058428 this_sequence A033997 A068729 
               A159775
%Y A069704 Adjacent sequences: A069701 A069702 A069703 this_sequence A069705 A069706 
               A069707
%K A069704 easy,nonn
%O A069704 1,1
%A A069704 Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 21 2002