Number of nXnXn triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= 9.
A166204
Number of nXnXn triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= 9.
Terms
- a(0) =1a(1) =10a(2) =4a(3) =12a(4) =201a(5) =886a(6) =9309a(7) =405175a(8) =4285591a(9) =161588843a(10) =25012399727a(11) =703336933599
External references
- oeis: A166204