Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

A260839

Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

Terms

    a(0) =1320a(1) =1645a(2) =3470a(3) =6232a(4) =8646a(5) =19718a(6) =37882a(7) =58489a(8) =116930a(9) =248515a(10) =412314a(11) =751247a(12) =1604892a(13) =2935059a(14) =5115588a(15) =10451412a(16) =20331520a(17) =35935935a(18) =69439734a(19) =138338285a(20) =252687084a(21) =471920997a(22) =934503484a(23) =1761244126a(24) =3253322750a(25) =6325629935

External references