Sum over all partitions lambda of n of binomial(|lambda|, |{lambda}|).

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =11a(5) =20a(6) =40a(7) =72a(8) =130a(9) =227a(10) =395a(11) =671a(12) =1124a(13) =1864a(14) =3040a(15) =4909a(16) =7830a(17) =12394a(18) =19388a(19) =30145a(20) =46395a(21) =70977a(22) =107661a(23) =162383a(24) =243108a(25) =362037a(26) =535684a(27) =788677a(28) =1154605a(29) =1682402