Riordan array (f(x)^4, f(x)), where 1 + x*f^4(x)/(1 - x*f(x)) = f(x).

Terms

a(0) =1a(1) =4a(2) =1a(3) =26a(4) =5a(5) =1a(6) =192a(7) =35a(8) =6a(9) =1a(10) =1531a(11) =270a(12) =45a(13) =7a(14) =1a(15) =12848a(16) =2215a(17) =362a(18) =56a(19) =8a(20) =1a(21) =111818a(22) =18961a(23) =3054a(24) =461a(25) =68a(26) =9a(27) =1a(28) =1000068a(29) =167455