106717domain: NAppears in sequencesNumber of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 5 X 5 X 5 subtriangle summing to 11.at n=7A154084Numbers k such that there exists i >= 1 such that k divides 3^3^i - 1.at n=31A367265