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FORMULA
| a(n)= sum(S(k, 12), k=0..n) with S(k, 12)=U(k, 6)=A004191(k) Chebyshev's polynomials of the second kind.
G.f.: 1/((1-x)*(1-12*x+x^2)) = 1/(1-13*x+13*x^2-x^3).
a(n)=13*a(n-1)-13*a(n-2)+a(n-3), n>=2, a(-1):=0, a(0)=1, a(1)=13.
a(n)=12*a(n-1)-a(n-2)+1, n>=1, a(-1):=0, a(0)=1.
a(n)=(S(n+1, 12) - S(n, 12) -1)/10.
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