%I #12 Aug 23 2024 17:33:41
%S 0,8,440,13002,291782,5718464,103948054,1806753034,30539121806,
%T 507006229578,8318320069722,135401306105052,2192221953687972,
%U 35363748022460400,569037825802441810,9140526218802015968,146649357444276412850,2350864549078452042124
%N Half the number of n X 4 binary arrays with no path of adjacent 1's or adjacent 0's from top row to bottom row.
%F a(n) = 2^(4*n-1) - A069379(n) + A069404(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