Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00000011.

A259887

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00000011.

Terms

    a(0) =34a(1) =67a(2) =215a(3) =499a(4) =936a(5) =2212a(6) =5352a(7) =11529a(8) =25397a(9) =58793a(10) =132494a(11) =294066a(12) =664222a(13) =1503071a(14) =3370883a(15) =7574191a(16) =17082212a(17) =38445840a(18) =86429444a(19) =194563077a(20) =438038913a(21) =985523653a(22) =2217627370a(23) =4991511166a(24) =11233246170a(25) =25277953979a(26) =56888391919

External references