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例子
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a(0)=1到a(4)=11多系统的非同构代表:
{} {1} {1,2} {{1},{1,2}} {{{1}},{{1},{1,2}}}
{{1},{2,3}} {{{1}},{{1},{2,3}}}
{{{1,2}},{{1},{1}}}
{{{1}},{{2},{1,2}}}
{{{1,2}},{{1},{2}}}
{{{1}},{{2},{1,3}}}
{{{1,2}},{{1},{3}}}
{{{1}},{{2},{3,4}}}
{{{1,2}},{{3},{4}}}
{{{2}},{{1},{1,3}}}
{{{2,3}},{{1},{1}}}
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