Power Set

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Problem

R(0) = 0. (the empty set. φ or {})
R(n+1) is the power set of R(n).
Please print out R(n).

http://en.wikipedia.org/wiki/Power_set

Inspired by http://www.tenasaku.com/cgi-bin/tepipi-latest.pl#diary20110601

Options

exec is denied

now post-mortem time, all source codes will be revealed

Sample input:_

1

Sample output:

{0}

Sample input:_

2

Sample output:

{0, {0}}

Sample input:_

4

Sample output:

{0, {0}, {{0}}, {0, {0}}, {{{0}}}, {0, {{0}}}, {{0}, {{0}}}, {0, {0}, {{0}}}, {{0, {0}}}, {0, {0, {0}}}, {{0}, {0, {0}}}, {0, {0}, {0, {0}}}, {{{0}}, {0, {0}}}, {0, {{0}}, {0, {0}}}, {{0}, {{0}}, {0, {0}}}, {0, {0}, {{0}}, {0, {0}}}}

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