Expansion of g.f.: (1-5*x+2*x^2+(2*x-1)*sqrt(x^2-6*x+1))/(4*x).

A238112

Expansion of g.f.: (1-5*x+2*x^2+(2*x-1)*sqrt(x^2-6*x+1))/(4*x).

Terms

    a(0) =0a(1) =0a(2) =1a(3) =5a(4) =23a(5) =107a(6) =509a(7) =2473a(8) =12235a(9) =61463a(10) =312761a(11) =1609005a(12) =8355423a(13) =43741635a(14) =230614773a(15) =1223414481a(16) =6525975315a(17) =34981856303a(18) =188341400945

External references