Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00100101 or 01010101.

A261263

Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00100101 or 01010101.

Terms

    a(0) =586a(1) =758a(2) =2948a(3) =10382a(4) =28540a(5) =85506a(6) =274100a(7) =842884a(8) =2548286a(9) =7832046a(10) =24162204a(11) =74075530a(12) =226969292a(13) =697051096a(14) =2140551114a(15) =6567905552a(16) =20155238082a(17) =61868865174a(18) =189897012544a(19) =582806503534

External references