G.f. A(x) satisfies A(x) = (1 + x*A(x)^(3/4) / (1+x))^4.

Terms

a(0) =1a(1) =4a(2) =14a(3) =56a(4) =241a(5) =1088a(6) =5082a(7) =24352a(8) =119036a(9) =591224a(10) =2975150a(11) =15136036a(12) =77721311a(13) =402276364a(14) =2096572304a(15) =10993229392a(16) =57951531087a(17) =306954017592