Number of nX2 0..1 arrays with every element unequal to 0, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A317809

Number of nX2 0..1 arrays with every element unequal to 0, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =3a(4) =5a(5) =10a(6) =23a(7) =54a(8) =131a(9) =321a(10) =789a(11) =1943a(12) =4788a(13) =11802a(14) =29094a(15) =71725a(16) =176826a(17) =435938a(18) =1074743a(19) =2649629a(20) =6532294a(21) =16104471a(22) =39703358a(23) =97883171a(24) =241317505a(25) =594935145a(26) =1466730843a(27) =3616023336a(28) =8914808626a(29) =21978235610

External references