G.f. A(x) satisfies A(x) = 1 + x + x^4*A(x)^4.

Terms

a(0) =1a(1) =1a(2) =0a(3) =0a(4) =1a(5) =4a(6) =6a(7) =4a(8) =5a(9) =28a(10) =84a(11) =140a(12) =162a(13) =304a(14) =1018a(15) =2644a(16) =4760a(17) =7364a(18) =15540a(19) =42680a(20) =102059a(21) =195904a(22) =356542a(23) =782880a(24) =1950844a(25) =4467288a(26) =9011156a(27) =17960676a(28) =39984254a(29) =94642292