-655360

Appears in sequences

• Triangle T, read by rows, where matrix power T^2 has 2*4^n in the secondary diagonal: [T^2](n+1,n) = 2*4^n, with all 1's in the main diagonal and zeros elsewhere.at n=16A117258
• Triangular sequence of coefficients of T_n(2^n*x) where T_n is the n-th Chebyshev polynomial.at n=18A139037