Number of factorizations with 2 levels of parentheses indexed by prime signatures. A050338(A025487).

A050339

Number of factorizations with 2 levels of parentheses indexed by prime signatures. A050338(A025487).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =4a(4) =10a(5) =16a(6) =30a(7) =54a(8) =22a(9) =75a(10) =74a(11) =176a(12) =102a(13) =206a(14) =267a(15) =535a(16) =399a(17) =518a(18) =950a(19) =526a(20) =1585a(21) =154a(22) =1094a(23) =1446a(24) =1344a(25) =3091a(26) =2252a(27) =4527a(28) =817a(29) =4158

External references