Expansion of g.f. z*(2-2*z+z^2+z^3)/((1+z)*(1-3*z+2*z^2-z^3)).

Terms

a(0) =2a(1) =2a(2) =7a(3) =15a(4) =37a(5) =84a(6) =197a(7) =456a(8) =1062a(9) =2467a(10) =5737a(11) =13335a(12) =31002a(13) =72069a(14) =167542a(15) =389486a(16) =905447a(17) =2104907a(18) =4893317a(19) =11375580a(20) =26445017a(21) =61477204a(22) =142917162a(23) =332242091a(24) =772369157a(25) =1795540447a(26) =4174125122a(27) =9703663625a(28) =22558281082