OFFSET
0,2
LINKS
FORMULA
a(n) = sum(S(k, 15), k=0..n) with S(k, 15) = U(k, 15/2) = A078364(k) Chebyshev's polynomials of the second kind.
G.f.: 1/((1-x)*(1-15*x+x^2)) = 1/(1-16*x+16*x^2-x^3).
a(n) = 16*a(n-1)-16*a(n-2)+a(n-3) with n>=2, a(-1)=0, a(0)=1, a(1)=16.
a(n) = 15*a(n-1)-a(n-2)+1 with n>=1, a(-1)=0, a(0)=1.
a(n) = (S(n+1, 15) - S(n, 15) -1)/13.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, Aug 31 2004
STATUS
approved