Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111.

A260068

Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111.

Terms

    a(0) =2131a(1) =5776a(2) =16344a(3) =34917a(4) =77061a(5) =251582a(6) =660896a(7) =1470739a(8) =4080236a(9) =12463280a(10) =30924518a(11) =77105282a(12) =228211895a(13) =637935403a(14) =1599037659a(15) =4357701023a(16) =12595214555a(17) =33560728043a(18) =87859868123a(19) =246975122762a(20) =686765810423

External references