-1594323

Appears in sequences

• Expansion of bracket function.at n=25A000748
• a(n) = Sum_{j=0..floor(n/3)} (-1)^j*binomial(n,3*j).at n=28A057681
• Expansion of (1-3*x+12*x^2)/((1-3*x)*(1+3*x)).at n=13A091103
• A transform of the Jacobsthal numbers.at n=29A103312
• Expansion of (1 - 3x)/(1 + 3*x^2).at n=25A128019
• Expansion of (1 - 3x)/(1 + 3*x^2).at n=26A128019
• Inverse binomial transform of A140962.at n=15A141413
• G.f.: A(x) = 1 + x/exp( Sum_{k>=1} (A((-1)^k*x) - 1)^k/k ).at n=28A157674
• a(n) = 3*a(n-2) for n > 2; a(1) = 3, a(2) = -1.at n=27A162852
• Expansion of g.f. (x + x^2)/(1 + 3*x^2).at n=27A287479
• Expansion of g.f. (x + x^2)/(1 + 3*x^2).at n=28A287479
• Powers of -3: a(n) = (-3)^n.at n=13A352779