Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011.

A260762

Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011.

Terms

    a(0) =190a(1) =265a(2) =652a(3) =1234a(4) =1740a(5) =3891a(6) =8056a(7) =12829a(8) =24824a(9) =52425a(10) =91422a(11) =166962a(12) =342344a(13) =633804a(14) =1145464a(15) =2263471a(16) =4316958a(17) =7882937a(18) =15150302a(19) =29161786a(20) =54045826a(21) =102292437a(22) =196570918a(23) =368716813a(24) =693829414a(25) =1326250831a(26) =2505952054

External references