-134217728

Appears in sequences

• Triangle read by rows. T(n, m) are the coefficients of Sidi polynomials.at n=43A075513
• Expansion of 1/(1+2*x^2).at n=54A077966
• Generalized Gaussian Fibonacci integers.at n=28A088138
• Expansion of (1+4x-24x^2)/((1-4x)(1+4x)).at n=14A091095
• Hankel transform of sequence (b(n)) where b(n) = Sum_{i=0..n} binomial(2*i,i).at n=27A098106
• a(n) = 2^floor(n/2)*((-1)^floor(n/2) + (-1)^n)/2.at n=55A102561
• Expansion of g.f. (1+x)/(1+2*x+4*x^2).at n=28A104537
• Hankel transform of Sum_{k=0..n} C(2k,k).at n=27A120580
• Powers of -2: a(n) = (-2)^n.at n=27A122803
• Expansion of (1+3*x)/(1+2*x).at n=28A123344
• Hankel transform of central coefficients of (1+k*x-2x^2)^n, k arbitrary integer.at n=6A127945
• Expansion of (1-4*x)/(1-2*x+4*x^2).at n=26A128018
• Expansion of (1-4*x)/(1-2*x+4*x^2).at n=27A128018
• Diagonal of A129819.at n=27A130668
• Triangle: signed version of A055134.at n=45A137370
• Expansion of (1-x)/(1 - 2*x + 4*x^2).at n=27A138230
• Expansion of (1-x)/(1 - 2*x + 4*x^2).at n=28A138230
• Inverse binomial transform of A001651.at n=29A141531
• a(n) = A154570(n) + A154570(n+1).at n=28A154589
• a(n) = A156591(n) + A156591(n+1).at n=28A157823