O.g.f. A(x) satisfies: A(x) = 1 + Integral (x*A(x)^4)' / (x*A(x))' dx.

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =43a(5) =171a(6) =677a(7) =2637a(8) =10035a(9) =37171a(10) =134009a(11) =472785a(12) =1655845a(13) =5910373a(14) =22254507a(15) =90625475a(16) =396822579a(17) =1803795507a(18) =8151776201a(19) =35314777505a(20) =142395796689a(21) =518352934225