a(1) = 2, a(n+1) is the smallest multiple of a(n) such that the digits are alternately odd and even. The unit digit is always even and parity alternates.

A078227

a(1) = 2, a(n+1) is the smallest multiple of a(n) such that the digits are alternately odd and even. The unit digit is always even and parity alternates.

Terms

    a(0) =2a(1) =4a(2) =8a(3) =16a(4) =32a(5) =96a(6) =672a(7) =45696a(8) =2787456a(9) =270383232a(10) =507238943232

External references