Triangle of coefficients of ordered cycle-index polynomials: T(n,k) = binomial(n,k)*Bell(k)*Bell(n-k).
A033306
Triangle of coefficients of ordered cycle-index polynomials: T(n,k) = binomial(n,k)*Bell(k)*Bell(n-k).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =2a(6) =5a(7) =6a(8) =6a(9) =5a(10) =15a(11) =20a(12) =24a(13) =20a(14) =15a(15) =52a(16) =75a(17) =100a(18) =100a(19) =75a(20) =52a(21) =203a(22) =312a(23) =450a(24) =500a(25) =450a(26) =312a(27) =203a(28) =877a(29) =1421
External references
- oeis: A033306