Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

A260836

Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

Terms

    a(0) =188a(1) =288a(2) =700a(3) =1224a(4) =1560a(5) =3470a(6) =6908a(7) =10070a(8) =18716a(9) =39478a(10) =64940a(11) =111162a(12) =228324a(13) =409632a(14) =690964a(15) =1345662a(16) =2532216a(17) =4354216a(18) =8095220a(19) =15462342a(20) =27373920a(21) =49529004a(22) =94027168a(23) =170716994a(24) =306172260a(25) =572849570a(26) =1056328308a(27) =1900057106

External references