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

Terms

a(0) =0a(1) =1a(2) =7a(3) =3a(4) =169a(5) =1523a(6) =133a(7) =72623a(8) =87149a(9) =823077a(10) =15638477a(11) =46915441a(12) =13834041a(13) =224803169a(14) =6936783521a(15) =5587964507a(18) =170187831339