Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101.

A261288

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101.

Terms

    a(0) =166a(1) =233a(2) =504a(3) =1147a(4) =2586a(5) =6034a(6) =14106a(7) =32496a(8) =75202a(9) =175008a(10) =405940a(11) =940390a(12) =2182098a(13) =5064284a(14) =11745648a(15) =27244774a(16) =63209588a(17) =146635614a(18) =340152614a(19) =789099398a(20) =1830590414a(21) =4246594798a(22) =9851282946a(23) =22853254768a(24) =53015328992

External references