Number of side-4 hexagonal 0..n arrays with values nondecreasing E, SW and SE.

A216940

Number of side-4 hexagonal 0..n arrays with values nondecreasing E, SW and SE.

Terms

    a(0) =260a(1) =27768a(2) =1664244a(3) =64697626a(4) =1783839948a(5) =37112483200a(6) =609829326268

External references