Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 4,5,2,1,1,1,2 for x=0,1,2,3,4,5,6.

A197855

Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 4,5,2,1,1,1,2 for x=0,1,2,3,4,5,6.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =18a(4) =139a(5) =1407a(6) =36344a(7) =1361785a(8) =74076700a(9) =9299546681

External references