We study the number of acyclic orientations on the generalized
two-dimensional Sierpinski gasket SG2,b​(n) at stage n with b equal to
two and three, and determine the asymptotic behaviors. We also derive upper
bounds for the asymptotic growth constants for SG2,b​ and d-dimensional
Sierpinski gasket SGd​.Comment: 20 pages, 8 figures and 6 table