OFFSET
0,3
COMMENTS
First column of inverse of Riordan array ((1+x)/(1+x+2x^2),x(1-2x)/(1+x+2x^2)).
Hankel transform is A166077.
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..500
FORMULA
Conjecture: 3*(n)*a(n) +5*(-5*n+9)*a(n-1) +69*(-n+2)*a(n-2) +5*(-11*n+27)*a(n-3) +14*(-n+3)*a(n-4)=0. - R. J. Mathar, Feb 10 2015
MATHEMATICA
CoefficientList[Series[(7+5x-Sqrt[1-10x-7x^2])/(2(3+5x+2x^2)), {x, 0, 30}], x] (* Harvey P. Dale, Nov 26 2011 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Oct 06 2009
STATUS
approved