Riordan array (1/(1-10*x-10*x^2), x/(1-10*x-10*x^2)).

Terms

a(0) =1a(1) =10a(2) =1a(3) =90a(4) =20a(5) =1a(6) =800a(7) =280a(8) =30a(9) =1a(10) =7100a(11) =3400a(12) =570a(13) =40a(14) =1a(15) =63000a(16) =38300a(17) =8800a(18) =960a(19) =50a(20) =1a(21) =559000a(22) =412000a(23) =120600a(24) =18000a(25) =1450a(26) =60a(27) =1a(28) =4960000a(29) =4296000