%I A110556
%S A110556 1,1,3,10,35,126,462,1716,6435,24310,92378,352716,1352078,5200300,
%T A110556 20058300,77558760,300540195,1166803110,4537567650,17672631900,
%U A110556 68923264410,269128937220,1052049481860,4116715363800,16123801841550
%V A110556 1,-1,3,-10,35,-126,462,-1716,6435,-24310,92378,-352716,1352078,-5200300,
               20058300,
%W A110556 -77558760,300540195,-1166803110,4537567650,-17672631900,68923264410,-269128937220,
%X A110556 1052049481860,-4116715363800,16123801841550
%N A110556 Binomial(2*n-1,n)*(-1)^n for n>0; a(0) = 1.
%C A110556 a(n) = A110555(2*n,n), central terms in triangle A110555;
%C A110556 a(n) = A088218(n)*(-1)^n.
%Y A110556 Another version of A001700, which is the main entry. Cf. A000984, A007318.
%Y A110556 Sequence in context: A167403 A001700 A088218 this_sequence A072266 A085282 
               A149036
%Y A110556 Adjacent sequences: A110553 A110554 A110555 this_sequence A110557 A110558 
               A110559
%K A110556 sign
%O A110556 0,3
%A A110556 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 27 2005