Denominator of Sum_{k=0..[n/2]} 1/binomial(n,k).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =12a(5) =10a(6) =60a(7) =105a(8) =140a(9) =63a(10) =280a(11) =1155a(12) =27720a(13) =25740a(14) =8008a(15) =9009a(16) =16380a(17) =17017a(18) =6126120a(19) =2909907a(20) =5542680a(21) =2645370a(22) =232792560a(23) =111546435a(24) =535422888a(25) =128707425a(26) =2974571600a(27) =717084225a(28) =80313433200a(29) =77636318760