Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101.

A260607

Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101.

Terms

    a(0) =1029a(1) =2480a(2) =7516a(3) =22944a(4) =70906a(5) =228678a(6) =727342a(7) =2311370a(8) =7375562a(9) =23635422a(10) =75483274a(11) =240680882a(12) =768878776a(13) =2457889646a(14) =7849301394a(15) =25058672956a(16) =80049377842a(17) =255735233668a(18) =816674565798

External references