Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010101.

A260099

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010101.

Terms

    a(0) =48a(1) =85a(2) =206a(3) =472a(4) =1116a(5) =2575a(6) =6068a(7) =14096a(8) =33044a(9) =76925a(10) =180064a(11) =419884a(12) =981640a(13) =2290567a(14) =5352572a(15) =12495004a(16) =29189140a(17) =68152069a(18) =159185904a(19) =371714924a(20) =868161704a(21) =2027353439a(22) =4734819476a(23) =11057193964a(24) =25823175228a(25) =60305591933

External references