OFFSET
2,2
COMMENTS
Column k=5 of triangle A236830. - Philippe Deléham, Feb 02 2014
LINKS
G. C. Greubel, Table of n, a(n) for n = 2..1000
FORMULA
G.f.: (x^2*C(x)^5)/(1-x*C(x)^3) where C(x) is the g.f. of A000108. - Philippe Deléham, Feb 02 2014
MATHEMATICA
Drop[CoefficientList[Series[(1-Sqrt[1-4*x])^5/(4*x*(8*x^2 -(1-Sqrt[1 - 4*x])^3)), {x, 0, 30}], x], 2] (* G. C. Greubel, Jul 16 2019 *)
PROG
(PARI) my(x='x+O('x^30)); Vec( (1-sqrt(1-4*x))^5/(4*x*(8*x^2 -(1-sqrt(1-4*x))^3))) \\ G. C. Greubel, Jul 16 2019
(Magma) R<x>:=PowerSeriesRing(Rationals(), 30); Coefficients(R!( (1-Sqrt(1-4*x))^5/(4*x*(8*x^2 -(1-Sqrt(1-4*x))^3)) )); // G. C. Greubel, Jul 16 2019
(Sage) a=((1-sqrt(1-4*x))^5/(4*x*(8*x^2 -(1-sqrt(1-4*x))^3))).series(x, 30).coefficients(x, sparse=False); a[2:] # G. C. Greubel, Jul 16 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved