Expansion of 1/((1-x)^2*sqrt(1-4x/(1-x)^4)).

Terms

a(0) =1a(1) =4a(2) =21a(3) =126a(4) =797a(5) =5190a(6) =34439a(7) =231556a(8) =1572135a(9) =10754148a(10) =74001735a(11) =511686726a(12) =3552251429a(13) =24743806370a(14) =172853699427