Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101.

A260974

Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101.

Terms

    a(0) =91a(1) =133a(2) =239a(3) =481a(4) =925a(5) =1873a(6) =3683a(7) =7321a(8) =14439a(9) =28529a(10) =56363a(11) =111523a(12) =220633a(13) =436539a(14) =863261a(15) =1707243a(16) =3376067a(17) =6677245a(18) =13206405a(19) =26120525a(20) =51660959a(21) =102173689a(22) =202075167a(23) =399659881a(24) =790442205a(25) =1563330291a(26) =3091935925

External references