Central coefficients of the Riordan matrix (1/(1-3*x^2),x/(1-x)) (A191582).

A191585

Central coefficients of the Riordan matrix (1/(1-3*x^2),x/(1-x)) (A191582).

Terms

    a(0) =1a(1) =1a(2) =6a(3) =19a(4) =74a(5) =276a(6) =1056a(7) =4047a(8) =15606a(9) =60382a(10) =234356a(11) =911802a(12) =3554864a(13) =13883650a(14) =54304788a(15) =212687199a(16) =833958918a(17) =3273341382a(18) =12859792932a(19) =50562992490a(20) =198954466524a(21) =783371113152

External references