Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101.

A260602

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101.

Terms

    a(0) =40a(1) =58a(2) =125a(3) =241a(4) =525a(5) =1029a(6) =2246a(7) =4407a(8) =9592a(9) =18930a(10) =41027a(11) =81192a(12) =175502a(13) =348438a(14) =750714a(15) =1494859a(16) =3211981a(17) =6412772a(18) =13742956a(19) =27507848a(20) =58807987a(21) =117983491a(22) =251666242a(23) =506004675a(24) =1077074116a(25) =2169965427a(26) =4609962160a(27) =9305093538

External references