Number of (n+1) X 3 0..3 arrays with every 2 X 3 or 3 X 2 subblock having exactly one clockwise edge increases.

A206200

Number of (n+1) X 3 0..3 arrays with every 2 X 3 or 3 X 2 subblock having exactly one clockwise edge increases.

Terms

    a(0) =480a(1) =1060a(2) =3008a(3) =9464a(4) =22576a(5) =67968a(6) =192808a(7) =496088a(8) =1475768a(9) =4018720a(10) =10894120a(11) =31512000a(12) =85274000a(13) =237162184a(14) =670298216a(15) =1827175160a(16) =5121768064a(17) =14281894072a(18) =39288809968a(19) =110061644032a(20) =305182278280a(21) =845001830872

External references