Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011.

A260277

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011.

Terms

    a(0) =34a(1) =46a(2) =99a(3) =202a(4) =366a(5) =714a(6) =1428a(7) =2750a(8) =5291a(9) =10334a(10) =20111a(11) =38936a(12) =75595a(13) =146976a(14) =285323a(15) =553794a(16) =1075608a(17) =2088887a(18) =4055703a(19) =7875257a(20) =15293121a(21) =29696093a(22) =57662890a(23) =111971304a(24) =217428312a(25) =422201962a(26) =819834467a(27) =1591965964a(28) =3091293283

External references