Number of nXnXn triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= 4.
A166199
Number of nXnXn triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= 4.
Terms
- a(0) =1a(1) =5a(2) =2a(3) =4a(4) =25a(5) =64a(6) =249a(7) =2376a(8) =9030a(9) =76249a(10) =1598732a(11) =10091912a(12) =165533393a(13) =6511049130a(14) =90909213960
External references
- oeis: A166199