

A130832


Number of cubes in Menger cube constructions by levels: Sum[20^(2^n), {n, 0, m}].


0




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 277=20 starting states. This fact makes making a level four or level five Menger construction a very difficult task.


LINKS

Table of n, a(n) for n=1..6.


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



