2433942domain: NAppears in sequencesNumber of zig-zag paths from top to bottom of a rectangle of width 11 with n rows whose color is not that of the top right corner.at n=20A153370Number of zig-zag paths from top to bottom of a rectangle of width 11 with 2n-1 rows whose color is not that of the top right corner.at n=10A153373