57523domain: NAppears in sequencesNumber of planar n X n X n binary triangular grids with no more than 1 one in any 3 X 3 X 3 subtriangle.at n=9A153550Number of 9X9X9 triangular nonnegative integer arrays with all sums of an element and its neighbors <= n.at n=1A166195Expansion of Product_{k>=1} (1 + x^k)^A050985(k).at n=23A301596