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

A297432

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

Terms

    a(0) =1a(1) =2a(2) =7a(3) =12a(4) =18a(5) =33a(6) =73a(7) =139a(8) =244a(9) =449a(10) =880a(11) =1680a(12) =3105a(13) =5781a(14) =10981a(15) =20806a(16) =39007a(17) =73112a(18) =137842a(19) =260073a(20) =489213a(21) =919503a(22) =1730944a(23) =3260449a(24) =6136804a(25) =11545760a(26) =21729985a(27) =40908585a(28) =77001561a(29) =144914586

External references