-3249

Appears in sequences

• Determinant of the n X n tridiagonal matrix M with the elements on the diagonals equal to 1, except M(n,n-1)=M(n-1,n)=n.at n=55A080322
• Triangle read by rows: T(n,k) is the coefficient A_k in the transformation Sum_{k=0..n} x^k = Sum_{k=0..n} A_k*(x+2*(-1)^k)^k.at n=32A249266
• G.f. A(x) satisfies: A(x) = A(x^2 - x^3)/x.at n=26A273218