-1505

Appears in sequences

• Expansion of (1+x^2)^2/(1+x^2-2x^3+x^4+x^6).at n=30A099493
• Expansion of e.g.f. det(I - M) where M_{j,k} = (j*x)^k/k! is the generic entry of a square matrix of order n, with 1 <= j,k <= n.at n=5A157503
• Consider the e.g.f. S(x,y) = Sum_{n>=0} Sum_{k=0..n} T(n,k) * x^(2*n-2*k+1) * y^(2*k) / ((2*n-2*k+1)!*(2*k)!) and related functions C(x,y) and D(x,y), as defined in the Formula section. Sequence gives the triangular array of coefficients T(n,k) (n>=0, 0<=k<=n) of S(x,y).at n=17A326800
• Consider the e.g.f. S(x,y) = Sum_{n>=0} Sum_{k=0..n} T(n,k) * x^(2*n-2*k+1) * y^(2*k) / ((2*n-2*k+1)!*(2*k)!) and related functions C(x,y) and D(x,y), as defined in the Formula section. Sequence gives the triangular array of coefficients T(n,k) (n>=0, 0<=k<=n) of S(x,y).at n=18A326800