OFFSET
0,3
COMMENTS
A modified Chebyshev transform of A000129. Under this transform, the g.f. G(x) is mapped to (1/(1-x^2))G(x/(1-x^2)).
LINKS
Index entries for linear recurrences with constant coefficients, signature (2,3,-2,-1).
FORMULA
G.f.: x/(1-2x-3x^2+2x^3+x^4); a(n)=2a(n-1)+3a(n-2)-2a(n-3)-a(n-4); a(n)=sum{k=0..floor(n/2), binomial(n-k, k)Pell(n-2k)}.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Oct 25 2004
STATUS
approved