OFFSET
0,9
COMMENTS
Inverse of Riordan array (1, x(1+x+x^2)) (A071675).
FORMULA
Riordan array (1, y) where y satisfies y + y^2 + y^3 = x; y = -2^(2/3)*((3*sqrt(3)*sqrt(27*x^2 + 14*x + 3) - 27*x - 7)^(1/3) - (3*sqrt(3)*sqrt(27*x^2 + 14*x + 3) + 27*x + 7)^(1/3) + 2^(1/3))/6.
EXAMPLE
Rows start
{1},
{0,1},
{0,-1,1},
{0,1,-2,1},
{0,0,3,-3,1},
...
CROSSREFS
KEYWORD
AUTHOR
Paul Barry, Feb 15 2005
STATUS
approved