Recip transform of 2*(1 + x^4 + x^5 + x^6)-1/(1-x).

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =43a(5) =181a(6) =797a(7) =3625a(8) =16903a(9) =80367a(10) =388157a(11) =1899093a(12) =9392501a(13) =46881963a(14) =235863891a(15) =1194811579a(16) =6089105493a(17) =31197589525a(18) =160601295503a(19) =830278627047