Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00001011 00010101 or 01010101.

A261374

Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00001011 00010101 or 01010101.

Terms

    a(0) =39a(1) =41a(2) =82a(3) =157a(4) =266a(5) =470a(6) =864a(7) =1553a(8) =2758a(9) =4960a(10) =8924a(11) =16001a(12) =28662a(13) =51503a(14) =92374a(15) =165796a(16) =297284a(17) =533858a(18) =957252a(19) =1718645a(20) =3081790a(21) =5533474a(22) =9922064a(23) =17814980a(24) =31944528a(25) =57356546a(26) =102846820a(27) =184661677a(28) =331120454a(29) =594527399

External references