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

A198159

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

Terms

    a(0) =1a(1) =4a(2) =13a(3) =134a(4) =2506a(5) =81923a(6) =5913801a(7) =836958994a(8) =235327275156

External references