%I #13 Aug 23 2024 17:33:45
%S 0,4,84,1074,11058,102448,896026,7578952,62820362,514178822,
%T 4174954460,33725176208,271523097884,2181288088576,17498432045552,
%U 140241880816930,1123280018219562,8993350007112124,71984384316723134,576073752326317448,4609640266662591130
%N Half the number of n X 3 binary arrays with no path of adjacent 1's or adjacent 0's from top row to bottom row.
%F a(n) = 2^(3*n-1) - A069378(n) + A069403(n). - _Sean A. Irvine_, Aug 23 2024
%Y Cf. 2 X n A000079, n X 1 A000225, vertical path of 1 A069361-A069395, vertical paths of 0+1 A069396-A069416, vertical path of 1 not 0 A069417-A069428, no vertical paths A069429-A069447, no horizontal or vertical paths A069448-A069452.
%K nonn,easy
%O 1,2
%A _R. H. Hardin_, Mar 22 2002
%E More terms from _Sean A. Irvine_, Aug 23 2024