Partial sums of A097331; binomial transform of A166587.

Terms

a(0) =1a(1) =2a(2) =2a(3) =3a(4) =3a(5) =5a(6) =5a(7) =10a(8) =10a(9) =24a(10) =24a(11) =66a(12) =66a(13) =198a(14) =198a(15) =627a(16) =627a(17) =2057a(18) =2057a(19) =6919a(20) =6919a(21) =23715a(22) =23715a(23) =82501a(24) =82501a(25) =290513a(26) =290513a(27) =1033413a(28) =1033413a(29) =3707853