Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010001.

A260170

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010001.

Terms

    a(0) =40a(1) =74a(2) =183a(3) =409a(4) =950a(5) =2221a(6) =5235a(7) =12063a(8) =28230a(9) =65845a(10) =153721a(11) =357676a(12) =835423a(13) =1947580a(14) =4542768a(15) =10590805a(16) =24709416a(17) =57615880a(18) =134380567a(19) =313384529a(20) =730933689a(21) =1704584262a(22) =3975550976a(23) =9271665730a(24) =21623741651a(25) =50430265244

External references