3018141domain: NAppears in sequencesNumber of 6 X 6 X 6 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.at n=25A166214a(n) is the smallest number m such that sigma(m)=22^n, or 0 if m does not exist.at n=5A180460