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

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =3a(5) =5a(6) =60a(7) =105a(8) =35a(9) =63a(10) =630a(11) =1155a(12) =6930a(13) =12870a(14) =24024a(15) =9009a(16) =9009a(17) =17017a(18) =306306a(19) =2909907a(20) =692835a(21) =1322685a(22) =58198140a(23) =111546435a(24) =66927861a(25) =128707425a(26) =371821450a(27) =717084225a(28) =20078358300a(29) =38818159380