-4004

Appears in sequences

• Riordan array ((1-x)/(1+x), x/(1+x)^2).at n=60A110162
• Row sums of number triangle related to the Jacobsthal numbers.at n=45A110325
• G.f.: (1-2*x)*sqrt(1-4*x).at n=10A126079
• Scaled coefficient table for Chebyshev polynomials 2*T(2*n, sqrt(x)/2) (increasing even scaled powers, without zero entries).at n=60A127677
• Irregular triangular array a(n,m) for third (k=3) convolution of Chebyshev's S(n,x) = U(n,x/2) polynomials, read by rows (n >=0, 0 <= m <= floor(n/2)).at n=43A128505
• G.f. satisfies: A(A(x)) = A(x) + A(x^2).at n=6A141140
• Triangle read by rows, characteristic polynomials of Cartan ring matrices.at n=60A152060
• Expansion of (1-3*x+x^3)/(1-2*x-x^2+x^3).at n=12A199853
• Coefficient triangle for the square of the monic integer Chebyshev T-polynomials A127672.at n=60A217476
• Coefficient array for the powers of x^2 of the square of the even-indexed Chebyshev C polynomials.at n=30A220668
• Expansion of (1 - 2*x^2)/(1 + x)^5. Fourth column of Riordan triangle A248156.at n=20A248160
• Triangle read by rows: coefficients of the Laplacian polynomial of the n-cycle graph C_n.at n=59A284982
• G.f.: Sum_{n=-oo..+oo} x^(n^2) * C(x)^(4*n-4), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).at n=21A356778