Number of n X 3 0..4 arrays with each element equal to the number its horizontal and vertical zero neighbors.

A197049

Number of n X 3 0..4 arrays with each element equal to the number its horizontal and vertical zero neighbors.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =10a(4) =18a(5) =38a(6) =78a(7) =156a(8) =320a(9) =654a(10) =1326a(11) =2706a(12) =5518a(13) =11228a(14) =22884a(15) =46634a(16) =94978a(17) =193518a(18) =394286a(19) =803220a(20) =1636448a(21) =3334030a(22) =6792334a(23) =13838202a(24) =28192958a(25) =57437684a(26) =117018884a(27) =238404906a(28) =485705682a(29) =989536598

External references