Number of n X 2 0..1 arrays with no 1 equal to more than two of its horizontal and vertical neighbors, with the exception of exactly two elements.

A283226

Number of n X 2 0..1 arrays with no 1 equal to more than two of its horizontal and vertical neighbors, with the exception of exactly two elements.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =6a(4) =49a(5) =272a(6) =1376a(7) =6620a(8) =30552a(9) =137028a(10) =601505a(11) =2595590a(12) =11046025a(13) =46470096a(14) =193602168a(15) =799863880a(16) =3280706728a(17) =13370543368a(18) =54184746441a(19) =218481349414a(20) =876965449193

External references