Next Oracle Release will be Oracle Database 18 instead 184.108.40.206
Release 12.2: New releases will be annual and the version will be the last two digits of the release year. The release originally planned as 220.127.116.11 will now be release 18, and the release originally planned as 18.104.22.168 will be release 19. Releases 18 and 19 will be treated as under the umbrella of 12.2 for Lifetime Support purposes. The current plan is for Oracle Database 19 to be the last release for 12.2. This may change in the future to Oracle 20 as the last release for 12.2.
My Oracle Support Note: Release Schedule of Current Database Releases (Doc ID 742060.1)