Expansion of g.f. x*(1+11*x+x^2)/((1-x)*(1+x)*(1-10*x^2)).

Terms

a(0) =0a(1) =1a(2) =11a(3) =12a(4) =121a(5) =122a(6) =1221a(7) =1222a(8) =12221a(9) =12222a(10) =122221a(11) =122222a(12) =1222221a(13) =1222222a(14) =12222221a(15) =12222222a(16) =122222221a(17) =122222222a(18) =1222222221a(19) =1222222222a(20) =12222222221a(21) =12222222222a(22) =122222222221a(23) =122222222222