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 A130832 Number of cubes in Menger cube constructions by levels: Sum[20^(2^n), {n, 0, m}]. 0
 20, 420, 160420, 25600160420, 655360000025600160420, 429496729600000000000655360000025600160420 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A Sierpinski gasket has three starting states: a Sierpinski carpet has eight starting states: A Sierpinski tetrahedron has four starting states: the Menger cube has 27-7=20 starting states. This fact makes making a level four or level five Menger construction a very difficult task. LINKS FORMULA a(m) = Sum[20^(2^n), {n, 0, m}] MATHEMATICA f[m_] := Sum[20^(2^n), {n, 0, m}] Table[f[n], {n, 0, 5}] CROSSREFS Sequence in context: A158601 A268738 A215290 * A180810 A109116 A190922 Adjacent sequences:  A130829 A130830 A130831 * A130833 A130834 A130835 KEYWORD nonn AUTHOR Roger L. Bagula, Aug 20 2007 STATUS approved

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Last modified February 22 15:52 EST 2019. Contains 320399 sequences. (Running on oeis4.)