Triangle, read by rows, that transforms diagonals in the table of coefficients of successive iterations of x*(1+x)^2 (cf. A166888).

A166890

Triangle, read by rows, that transforms diagonals in the table of coefficients of successive iterations of x*(1+x)^2 (cf. A166888).

Terms

    a(0) =1a(1) =2a(2) =1a(3) =9a(4) =4a(5) =1a(6) =78a(7) =30a(8) =6a(9) =1a(10) =1038a(11) =364a(12) =63a(13) =8a(14) =1a(15) =18968a(16) =6233a(17) =986a(18) =108a(19) =10a(20) =1a(21) =443595a(22) =139008a(23) =20685a(24) =2072a(25) =165a(26) =12a(27) =1a(28) =12681960a(29) =3833052

External references