Triangle, read by rows, that transforms diagonals in the table of coefficients of successive iterations of x+x^2+x^3 (cf. A166880).

A166884

Triangle, read by rows, that transforms diagonals in the table of coefficients of successive iterations of x+x^2+x^3 (cf. A166880).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =2a(5) =1a(6) =15a(7) =9a(8) =3a(9) =1a(10) =114a(11) =62a(12) =18a(13) =4a(14) =1a(15) =1159a(16) =593a(17) =157a(18) =30a(19) =5a(20) =1a(21) =14838a(22) =7266a(23) =1812a(24) =316a(25) =45a(26) =6a(27) =1a(28) =229401a(29) =108720

External references