Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010001.

A260540

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010001.

Terms

    a(0) =337a(1) =566a(2) =1411a(3) =2775a(4) =4398a(5) =10949a(6) =22212a(7) =38389a(8) =86646a(9) =186223a(10) =333028a(11) =690553a(12) =1521828a(13) =2869799a(14) =5631896a(15) =12249267a(16) =24273164a(17) =46855557a(18) =98826636a(19) =201859033a(20) =392337270a(21) =804788515a(22) =1662271148a(23) =3279380771a(24) =6610407134a(25) =13637789673

External references