1094400domain: NAppears in sequencesNumber of 3X3X3 triangular 0..n arrays with some element plus some adjacent element totalling n exactly once.at n=10A270258Number of 4-cycles in the n-halved cube graph.at n=9A290027Numbers k such that A051378(k) > 2*k and A333926(k) <= 2*k.at n=17A349284