271906503420domain: NAppears in sequencesNumber of nXnXn triangular 0..7 arrays with some element plus some adjacent element totalling 7+1 or 7-1 exactly once.at n=4A270605Number of 5X5X5 triangular 0..n arrays with some element plus some adjacent element totalling n+1 or n-1 exactly once.at n=6A270610