Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010001.

A260171

Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010001.

Terms

    a(0) =74a(1) =167a(2) =419a(3) =1001a(4) =2500a(5) =6344a(6) =15847a(7) =39584a(8) =99741a(9) =250297a(10) =626433a(11) =1572166a(12) =3946872a(13) =9894451a(14) =24814854a(15) =62266809a(16) =156182193a(17) =391707889a(18) =982630798a(19) =2464919670a(20) =6182653471a(21) =15508493498a(22) =38902275855a(23) =97581089767a(24) =244769200723

External references