G.f.: (21 + 101*x + 97*x^2 + 22*x^3 + x^4)/(1 - x)^5.

Terms

a(0) =21a(1) =206a(2) =917a(3) =2757a(4) =6571a(5) =13446a(6) =24711a(7) =41937a(8) =66937a(9) =101766a(10) =148721a(11) =210341a(12) =289407a(13) =388942a(14) =512211a(15) =662721a(16) =844221a(17) =1060702a(18) =1316397a(19) =1615781a(20) =1963571a(21) =2364726a(22) =2824447a(23) =3348177a(24) =3941601a(25) =4610646a(26) =5361481a(27) =6200517a(28) =7134407a(29) =8170046