p-INVERT of (0,1,0,1,0,1,...), where p(S) = (1 - S)(1 - 2 S).

Terms

a(0) =3a(1) =7a(2) =18a(3) =45a(4) =111a(5) =272a(6) =663a(7) =1611a(8) =3906a(9) =9457a(10) =22875a(11) =55296a(12) =133611a(13) =322751a(14) =779490a(15) =1882341a(16) =4545159a(17) =10974256a(18) =26496255a(19) =63970947a(20) =154444914a(21) =372871721a(22) =900206067a(23) =2173312512a(24) =5246877459a(25) =12667142455a(26) =30581283762a(27) =73829906397a(28) =178241414367a(29) =430313249360