Expansion of g.f. 5*(1-3*x+x^2)/(1-5*x+5*x^2).

Terms

a(0) =5a(1) =10a(2) =30a(3) =100a(4) =350a(5) =1250a(6) =4500a(7) =16250a(8) =58750a(9) =212500a(10) =768750a(11) =2781250a(12) =10062500a(13) =36406250a(14) =131718750a(15) =476562500a(16) =1724218750a(17) =6238281250a(18) =22570312500a(19) =81660156250a(20) =295449218750