Expansion of g.f. (1-2*x+51*x^2)/(1-x)^3.

Terms

a(0) =1a(1) =1a(2) =51a(3) =151a(4) =301a(5) =501a(6) =751a(7) =1051a(8) =1401a(9) =1801a(10) =2251a(11) =2751a(12) =3301a(13) =3901a(14) =4551a(15) =5251a(16) =6001a(17) =6801a(18) =7651a(19) =8551a(20) =9501a(21) =10501a(22) =11551a(23) =12651a(24) =13801a(25) =15001a(26) =16251a(27) =17551a(28) =18901a(29) =20301