Lucky numbers with consecutive digits.

Terms

a(0) =21a(1) =43a(2) =67a(3) =87a(4) =321a(5) =4321a(6) =4567a(7) =6789a(8) =78901a(9) =432109a(10) =9012345a(11) =67890123a(12) =109876543a(13) =123456789a(14) =6543210987a(15) =8901234567