Number of 2 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 3 neighboring 1s.

A297520

Number of 2 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 3 neighboring 1s.

Terms

    a(0) =1a(1) =5a(2) =17a(3) =33a(4) =65a(5) =193a(6) =529a(7) =1185a(8) =2737a(9) =7169a(10) =18257a(11) =43425a(12) =104945a(13) =264001a(14) =656785a(15) =1597665a(16) =3913009a(17) =9708161a(18) =23980241a(19) =58804257a(20) =144593009a(21) =357011905a(22) =879991825a(23) =2164014945a(24) =5327178673a(25) =13131288833a(26) =32347250513a(27) =79624144545a(28) =196075443953

External references