Number of 2 X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 0 or 2 neighboring 1s.

A297339

Number of 2 X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 0 or 2 neighboring 1s.

Terms

    a(0) =4a(1) =8a(2) =22a(3) =53a(4) =134a(5) =333a(6) =833a(7) =2078a(8) =5190a(9) =12956a(10) =32349a(11) =80764a(12) =201645a(13) =503445a(14) =1256952a(15) =3138228a(16) =7835210a(17) =19562153a(18) =48840794a(19) =121940721a(20) =304449181a(21) =760117722a(22) =1897784554a(23) =4738195288a(24) =11829843673a(25) =29535549464a(26) =73741353337a(27) =184109904521

External references