Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001011.

A261549

Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001011.

Terms

    a(0) =80a(1) =132a(2) =269a(3) =484a(4) =871a(5) =1702a(6) =3230a(7) =6084a(8) =11656a(9) =22140a(10) =41998a(11) =80163a(12) =152575a(13) =290154a(14) =552862a(15) =1052566a(16) =2003661a(17) =3815643a(18) =7265371a(19) =13832801a(20) =26339615a(21) =50153430a(22) =95494793a(23) =181830620a(24) =346224829a(25) =659237773a(26) =1255247777a(27) =2390111154a(28) =4550973946

External references