Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101.

A259994

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101.

Terms

    a(0) =48a(1) =99a(2) =284a(3) =641a(4) =1228a(5) =2943a(6) =7284a(7) =15683a(8) =34012a(9) =81017a(10) =186614a(11) =409327a(12) =928000a(13) =2153685a(14) =4861084a(15) =10890015a(16) =24884066a(17) =56836211a(18) =128191444a(19) =290174291a(20) =661545278a(21) =1501862093a(22) =3397770104a(23) =7714956093a(24) =17539682412a(25) =39769793417

External references