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

A297426

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

Terms

    a(0) =1a(1) =7a(2) =14a(3) =22a(4) =68a(5) =163a(6) =320a(7) =782a(8) =1889a(9) =4109a(10) =9474a(11) =22365a(12) =50630a(13) =115709a(14) =268817a(15) =616265a(16) =1410697a(17) =3253586a(18) =7480630a(19) =17161490a(20) =39477589a(21) =90787636a(22) =208528864a(23) =479338273a(24) =1102090695a(25) =2532624372a(26) =5820869563a(27) =13380882748a(28) =30754476169a(29) =70685300713

External references