Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010001.

A260174

Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010001.

Terms

    a(0) =950a(1) =2500a(2) =6813a(3) =19701a(4) =61216a(5) =189092a(6) =572908a(7) =1765974a(8) =5534722a(9) =16874335a(10) =52310860a(11) =162084954a(12) =502275218a(13) =1543181152a(14) =4795244300a(15) =14814191502a(16) =45829422118a(17) =141421951282a(18) =438617706688

External references