G.f.: sqrt( (1-x - sqrt(1-14*x+x^2)) / (6*x*(1-14*x+x^2)) ).

A245927

G.f.: sqrt( (1-x - sqrt(1-14*x+x^2)) / (6*x*(1-14*x+x^2)) ).

Terms

    a(0) =1a(1) =9a(2) =99a(3) =1175a(4) =14499a(5) =183195a(6) =2351805a(7) =30539241a(8) =400000275a(9) =5274560891a(10) =69929215641a(11) =931226954949

External references