Numbers with even decimal digits in decreasing order.

Terms

a(0) =0a(1) =2a(2) =4a(3) =6a(4) =8a(5) =20a(6) =40a(7) =42a(8) =60a(9) =62a(10) =64a(11) =80a(12) =82a(13) =84a(14) =86a(15) =420a(16) =620a(17) =640a(18) =642a(19) =820a(20) =840a(21) =842a(22) =860a(23) =862a(24) =864a(25) =6420a(26) =8420a(27) =8620a(28) =8640a(29) =8642