a(n) is the n-th order Taylor polynomial (centered at 0) of S(x)^(2*n ) evaluated at x = 1, where S(x) = (1 - x - sqrt(1 - 6*x + x^2))/(2*x) is the o.g.f. of the Schröder numbers A006318.

A333091

a(n) is the n-th order Taylor polynomial (centered at 0) of S(x)^(2*n ) evaluated at x = 1, where S(x) = (1 - x - sqrt(1 - 6*x + x^2))/(2*x) is the o.g.f. of the Schröder numbers A006318.

Terms

    a(0) =1a(1) =5a(2) =57a(3) =761a(4) =10817a(5) =159005a(6) =2386857a(7) =36348401a(8) =559362561a(9) =8676917429a(10) =135445348057

External references