Number of (n+2) X (6+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 or 01010101.

A259740

Number of (n+2) X (6+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 or 01010101.

Terms

    a(0) =152a(1) =414a(2) =1514a(3) =4456a(4) =12086a(5) =36522a(6) =110886a(7) =321402a(8) =940024a(9) =2797222a(10) =8258758a(11) =24257464a(12) =71561342a(13) =211332750a(14) =622843492a(15) =1835798648a(16) =5415224264a(17) =15970038332a(18) =47084802318a(19) =138843880250a(20) =409450822484

External references