Number of nXnXn triangular 0..3 arrays with every horizontal row nondecreasing, first elements of rows nonincreasing, last elements of rows nondecreasing, and every row having the same average value.

A215177

Number of nXnXn triangular 0..3 arrays with every horizontal row nondecreasing, first elements of rows nonincreasing, last elements of rows nondecreasing, and every row having the same average value.

Terms

    a(0) =4a(1) =6a(2) =12a(3) =26a(4) =80a(5) =328a(6) =1584a(7) =9026a(8) =67628a(9) =563302a(10) =5744464a(11) =69602320a(12) =978445100a(13) =15683210094a(14) =298177611420

External references