Expansion of (1 + x + 21*x^2 + x^3 + x^4)/(1 - x)^5.

Terms

a(0) =1a(1) =6a(2) =41a(3) =156a(4) =426a(5) =951a(6) =1856a(7) =3291a(8) =5431a(9) =8476a(10) =12651a(11) =18206a(12) =25416a(13) =34581a(14) =46026a(15) =60101a(16) =77181a(17) =97666a(18) =121981a(19) =150576a(20) =183926a(21) =222531a(22) =266916a(23) =317631a(24) =375251a(25) =440376a(26) =513631a(27) =595666a(28) =687156a(29) =788801