Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101.

A261290

Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101.

Terms

    a(0) =540a(1) =743a(2) =2104a(3) =6034a(4) =17094a(5) =51268a(6) =153144a(7) =446786a(8) =1313726a(9) =3893926a(10) =11482268a(11) =33790756a(12) =99697166a(13) =294209526a(14) =867275046a(15) =2557044420a(16) =7542082102a(17) =22241722888a(18) =65583553668a(19) =193403914160a(20) =570355004810

External references