Expansion of cosh(7*arctanh(2*sqrt(x))).

Terms

a(0) =1a(1) =98a(2) =1862a(3) =19796a(4) =160454a(5) =1114428a(6) =7008540a(7) =41132520a(8) =229435206a(9) =1230873644a(10) =6403088692a(11) =32488200472a(12) =161473267228a(13) =788758622680