Expansion of cosh(5*arctanh(2*sqrt(x))).

Terms

a(0) =1a(1) =50a(2) =550a(3) =4020a(4) =24710a(5) =138012a(6) =725340a(7) =3655080a(8) =17859270a(9) =85230860a(10) =399257716a(11) =1842353240a(12) =8396404380a(13) =37868584600a(14) =169278679800a(15) =750923914320