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

Terms

a(0) =0a(1) =1a(2) =11a(3) =21a(4) =121a(5) =221a(6) =1221a(7) =2221a(8) =12221a(9) =22221a(10) =122221a(11) =222221a(12) =1222221a(13) =2222221a(14) =12222221a(15) =22222221a(16) =122222221a(17) =222222221a(18) =1222222221a(19) =2222222221a(20) =12222222221a(21) =22222222221a(22) =122222222221a(23) =222222222221