Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001111.

A260368

Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001111.

Terms

    a(0) =1378a(1) =2047a(2) =5806a(3) =12858a(4) =15440a(5) =38370a(6) =98032a(7) =140897a(8) =274244a(9) =711411a(10) =1222386a(11) =2119236a(12) =5089490a(13) =9954145a(14) =17052298a(15) =37181977a(16) =77288928a(17) =137928650a(18) =279219594a(19) =589162026a(20) =1099902766a(21) =2142331748a(22) =4472874520a(23) =8654078147a(24) =16619752932

External references