%I #9 Apr 07 2021 18:41:26
%S 3,35,269,1723,10123,56757,309755,1663515,8846821,46767491,246319875,
%T 1294402053,6792548971,35614277883,186632524741,977711862035,
%U 5120933346419
%N Half the number of 3 X n binary arrays with no path of adjacent 1's or adjacent 0's from top to bottom or side to side.
%Y Cf. 2 X n 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
%O 2,1
%A _R. H. Hardin_, Mar 22 2002