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

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =11a(6) =24a(7) =57a(8) =141a(9) =349a(10) =871a(11) =2212a(12) =5688a(13) =14730a(14) =38403a(15) =100829a(16) =266333a(17) =706997a(18) =1885165a(19) =5047522a(20) =13565203a(21) =36578497a(22) =98934826a(23) =268342933a(24) =729709432a(25) =1989021256a(26) =5433518806a(27) =14873285506a(28) =40790118487a(29) =112064912455