126244domain: NAppears in sequencesa(n) = Sum_{k=0..m} T(n,k) * T(n,k+1), where m=0 for n=1; m=n for n >= 2; and T is given by A026120.at n=6A027323Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 4 X 4 X 4 subtriangle summing to 7.at n=1A154064