Numerator of Sum_{k=0..n} 1/C(2*n, 2*k).

Terms

a(0) =1a(1) =2a(2) =13a(3) =32a(4) =73a(5) =647a(6) =28211a(7) =6080a(8) =18181a(9) =1542158a(10) =2786599a(11) =29229544a(12) =134354573a(13) =745984697a(14) =80530073893a(15) =291816652544a(16) =274050911261a(17) =258328905974