Number of 3Xn 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A302529

Number of 3Xn 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =10a(2) =28a(3) =42a(4) =100a(5) =290a(6) =730a(7) =1700a(8) =4246a(9) =10758a(10) =26632a(11) =65846a(12) =164130a(13) =408716a(14) =1015998a(15) =2527374a(16) =6288152a(17) =15643694a(18) =38924730a(19) =96845564a(20) =240934118a(21) =599472054a(22) =1491590968a(23) =3711076182a(24) =9233281458a(25) =22973573260a(26) =57160260398a(27) =142218013758

External references