Number of nX4 0..4 arrays with each element equal to the number its horizontal and vertical zero neighbors.

A197050

Number of nX4 0..4 arrays with each element equal to the number its horizontal and vertical zero neighbors.

Terms

    a(0) =3a(1) =6a(2) =18a(3) =42a(4) =108a(5) =274a(6) =692a(7) =1754a(8) =4442a(9) =11248a(10) =28488a(11) =72146a(12) =182712a(13) =462728a(14) =1171876a(15) =2967826a(16) =7516146a(17) =19034954a(18) =48206826a(19) =122085820a(20) =309187486a(21) =783030352a(22) =1983057390a(23) =5022176478a(24) =12718873752a(25) =32211084212a(26) =81575929322a(27) =206594481604

External references