Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010001 00010101 or 01010101.

A261106

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010001 00010101 or 01010101.

Terms

    a(0) =28a(1) =33a(2) =63a(3) =97a(4) =183a(5) =289a(6) =547a(7) =865a(8) =1639a(9) =2593a(10) =4915a(11) =7777a(12) =14743a(13) =23329a(14) =44227a(15) =69985a(16) =132679a(17) =209953a(18) =398035a(19) =629857a(20) =1194103a(21) =1889569a(22) =3582307a(23) =5668705a(24) =10746919a(25) =17006113a(26) =32240755a(27) =51018337a(28) =96722263a(29) =153055009

External references