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

A302165

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

Terms

    a(0) =4a(1) =6a(2) =7a(3) =12a(4) =20a(5) =34a(6) =56a(7) =94a(8) =156a(9) =262a(10) =436a(11) =730a(12) =1216a(13) =2034a(14) =3392a(15) =5670a(16) =9460a(17) =15806a(18) =26380a(19) =44066a(20) =73560a(21) =122858a(22) =205112a(23) =342542a(24) =571916a(25) =955062a(26) =1594660a(27) =2662890a(28) =4446320a(29) =7424674

External references