-59049

Appears in sequences

• Scaled Chebyshev U-polynomials evaluated at sqrt(3)/2; expansion of 1/(1 - 3*x + 3*x^2).at n=19A057083
• a(n) = Sum_{j=0..floor(n/3)} (-1)^j*binomial(n,3*j+1).at n=21A057682
• a(n) = Sum_{j=0..floor(n/3)} (-1)^j*binomial(n,3*j+1).at n=22A057682
• An inverse Catalan transform of A003462.at n=20A106233
• Expansion of (1+2*x)/(1+3*x+3*x^2).at n=21A123877
• a(2n+1)=3a(2n)-3a(2n-1)+2a(2n-2), a(2n+2)=3a(2n+1)-3a(2n), a(0)=a(1)=a(2)=1.at n=40A131292
• Sequence is identical to its third differences in absolute value: a(0), a(1), a(2), a(2n+1)=3a(2n)-3a(2n-1)+2a(2n-2), a(2n+2)=3a(2n+1)-3a(2n), with a(0)=a(1)=0, a(2)=1.at n=39A131665
• a(n) = 4*a(n-1) - 7*a(n-2) + 6*a(n-3) - 3*a(n-4), starting with 0, 1, 2, 3.at n=21A134581
• a(n) = 3*a(n-2) for n > 2; a(1) = 3, a(2) = -1.at n=21A162852
• Triangle, read by rows, T(n,k) = (-1)^k*binomial(n, k)*3^(n-k).at n=46A164942
• Totally multiplicative sequence with a(p) = 9*(p-3) for prime p.at n=31A167319
• a(n) = 3^n*A168053(n).at n=8A171557
• a(n) = 3*a(n-1) - 9*a(n-2), with a(0)=0, a(1)=1.at n=11A190963
• Expansion of (4+3*x)/(1+3*x).at n=9A256096
• Dirichlet inverse of A133494, 3^(n-1).at n=10A349453