OFFSET
0,2
COMMENTS
Image of 1/sqrt(1-6x+x^2) under the mapping that takes g(x) to (1/(1+x^2))g(x/(1+x^2)).
FORMULA
G.f.: 1/sqrt(1-6x+3x^2-6x^3+x^4); a(n)=sum{k=0..n, binomial(n-k, k)(-1)^k*A001850(n-2k)}.
D-finite with recurrence: n*a(n) +3*(-2*n+1)*a(n-1) +3*(n-1)*a(n-2) +3*(-2*n+3)*a(n-3) +(n-2)*a(n-4)=0. - R. J. Mathar, Feb 20 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul Barry, Dec 01 2004
STATUS
approved