Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101.

A260976

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101.

Terms

    a(0) =483a(1) =481a(2) =732a(3) =1513a(4) =2714a(5) =5506a(6) =9728a(7) =18578a(8) =33658a(9) =66832a(10) =122644a(11) =237212a(12) =431888a(13) =836918a(14) =1545484a(15) =2982194a(16) =5509198a(17) =10561098a(18) =19597590a(19) =37523150a(20) =69861252a(21) =133304344a(22) =248584050a(23) =473406314a(24) =884926304a(25) =1682544698a(26) =3149522270

External references