8746813158domain: NAppears in sequencesNumber of nXnXn triangular 0..7 arrays with some element plus some adjacent element totalling 7+1, 7 or 7-1 exactly once.at n=4A270849Number of 5 X 5 X 5 triangular 0..n arrays with some element plus some adjacent element totaling n+1, n or n-1 exactly once.at n=6A270854