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

A197924

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

Terms

    a(0) =1a(1) =4a(2) =12a(3) =56a(4) =413a(5) =5592a(6) =118914a(7) =4075124a(8) =230222994

External references